CCD (Charge Coupled Device) machine vision detection equipment

Abstract

The invention belongs to the technical field of detection equipment, and particularly relates to CCD machine vision detection equipment which comprises an equipment shell, a working cavity is formed in the equipment shell, a transparent glass disc is rotationally connected to the inner bottom wall of the working cavity, and a first motor used for driving the transparent glass disc is fixedly connected into the equipment shell; and the feeding mechanism is used for continuously feeding the parts in the detection process, and the feeding mechanism comprises a supporting table arranged on one side of the equipment shell. Through the arrangement of the detection mechanism, in the detection process, the top defect of the part is shot from top to bottom through a first camera, the bottom defect of the part is shot from bottom to top through a second camera, and the defects around the part are shot through a third camera and a fourth camera; and then image signals transmitted by the first camera, the second camera, the third camera and the fourth camera are processed through the processing system, comprehensive detection of the parts is achieved, and the production quality of the parts is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of detection equipment, and in particular relates to a CCD machine vision detection equipment. Background Art

[0002] CCD visual inspection equipment is a device that uses a charge-coupled device image sensor to obtain an object image and detects, measures, identifies and analyzes the object through image processing technology. During the use of CCD visual inspection equipment, the CCD image sensor is composed of many photosensitive units. When light is irradiated onto the CCD chip, the photosensitive unit converts the light signal into an electrical signal. These electrical signals are stored and transmitted in a certain order to form an image electrical signal corresponding to the photographed object. After amplification, analog-to-digital conversion and other processing, the image electrical signal is converted into a digital image signal and transmitted to a computer or a special image processing system. Subsequently, edge detection, shape analysis, color recognition, texture analysis and other algorithms are used to extract the feature information of the object from the pre-processed image, such as the edge, contour, size, position, color, etc. of the object, to detect whether the product is qualified.

[0003] In the process of manufacturing and processing optical communication connector parts, since the flatness of the ferrule end face needs to be controlled within 0.3μm and the concentricity error needs to be less than 1μm, manual inspection cannot meet the inspection accuracy. Therefore, it is necessary to use CCD machine vision inspection equipment to inspect it. However, the existing CCD machine vision inspection equipment often has the following technical problems when inspecting whether the parts are qualified: During the inspection process, it is impossible to accurately inspect parts from all directions, resulting in poor comprehensiveness of parts inspection. Some unqualified parts may fail to meet the inspection standards due to incomplete inspection, affecting the production quality of parts. During the inspection process, the inspection equipment is often placed directly in the factory, and the intensity and direction of the ambient light in the factory are prone to change. For example, in the morning and afternoon time periods, sunlight shines into the factory from different sides, and there is a difference in lighting between the space facing the sunlight and the space on the backlight side of the factory, resulting in differences in the direction of ambient light in the factory throughout the day. At the same time, during the day and night time periods, the factory will switch between natural light and lighting, resulting in differences in the intensity of ambient light in the factory. Such changes in the intensity and direction of ambient light will cause unstable lighting on the surface of parts during the inspection process, thereby affecting the shooting effect and inspection accuracy of the parts. Summary of the invention

[0004] The purpose of the present invention is to address the problems raised in the above-mentioned background technology and to provide a CCD machine vision inspection device that can detect the intensity and approximate direction of ambient light by detecting the intensity of polarized light and the comparison between them through multiple optical sensors, and adaptively adjust the lighting effects of multiple light sources on parts.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: A CCD machine vision detection device, comprising: An equipment housing, wherein a working chamber is provided inside the equipment housing, a transparent glass plate is rotatably connected to the inner bottom wall of the working chamber, and a first motor for driving the transparent glass plate is fixedly connected inside the equipment housing; A feeding mechanism, used for continuously feeding parts during the inspection process, the feeding mechanism comprises a support platform arranged on one side of the equipment housing, the upper end of the support platform is fixedly connected to a support plate, the upper end of the support plate is fixedly connected to a feeding cylinder, and a conveyor belt assembly is fixedly connected to an outer wall of one side of the equipment housing, used for conveying the parts in the feeding cylinder to the transparent glass plate; An inspection mechanism is used to perform visual inspection on parts to screen out qualified parts. The inspection mechanism includes a first camera arranged above a transparent glass plate and a second camera arranged below the transparent glass plate. The first camera and the second camera photograph defects of parts from top to bottom and from bottom to top, respectively. A third camera and a fourth camera are arranged above the transparent glass plate at both sides of the first camera. The third camera and the fourth camera photograph defects of parts from both sides, respectively. An NG discharge port, an OK discharge port and a discharge port to be inspected are also arranged above the transparent glass plate. A processing system, used for processing the image signals transmitted by the first camera, the second camera, the third camera and the fourth camera, and selectively discharging the parts from the NG discharge port, the OK discharge port and the to-be-inspected discharge port; The illumination combination mechanism is used to flexibly combine the illumination light during the detection process to improve the detection effect of the parts.

[0006] Preferably, the lighting combination mechanism includes an arc-shaped installation box arranged above the transparent glass plate, the upper arc surface of the arc-shaped installation box is penetrated and fixedly connected with a plurality of equally distributed polarizing plates, the inner bottom surface of the arc-shaped installation box is fixedly connected with a plurality of equally distributed optical sensors, and the plurality of optical sensors correspond one-to-one to the plurality of polarizing plates, the lower arc surface of the arc-shaped installation box is fixedly connected with a strip light bar, the strip light bar is provided with a plurality of equally distributed light sources, and the outer wall of the device housing is fixedly connected with a PLC controller.

[0007] Preferably, the PLC controller controls the circuit and algorithm according to the electrical signals fed back by the multiple optical sensors to switch the light source combination among the multiple light sources.

[0008] Preferably, the transmission belt assembly includes a mounting frame fixedly connected to the outer wall of one side of the equipment shell, two conveying rollers are rotatably connected inside the mounting frame, a conveying belt is sleeved between the two conveying rollers, a second motor is fixedly connected to the outer wall of one side of the mounting frame, the second motor is used to drive one of the two conveying rollers to rotate, and a synchronous belt assembly is provided between the roller shafts of the two conveying rollers for driving the two conveying rollers to rotate synchronously.

[0009] Preferably, a telescopic rod is coaxially fixedly connected to the lower end of the transparent glass plate, and the telescopic rod is divided into a fixed outer rod and a telescopic inner rod, the telescopic inner rod is fixedly connected to the lower end of the transparent glass plate, and the fixed outer rod is fixedly connected to the output end of the first motor.

[0010] Preferably, a feed inlet adjustment mechanism is also provided above the mounting frame, for adjusting the subsequent feeding speed of the parts according to the weight of the parts on the transparent glass plate, the feed inlet adjustment mechanism comprises a U-shaped plate fixedly connected to the upper end of the mounting frame, the upper wall of the U-shaped plate is rotatably connected with two symmetrically arranged rotating rods, each of the rotating rods extending to the position below the U-shaped plate is fixedly connected to a material baffle plate, and each of the rotating rods extending to the position above the U-shaped plate is fixedly connected to a gear, the upper end of the U-shaped plate is fixedly connected to a guide rail, a rack is slidably connected to the guide rail in a horizontal direction, and the two gears are respectively meshed with two sides of the rack, and an electromagnet is fixedly connected to the side wall of the rack and the inner wall of the guide rail, and the same poles of the two electromagnets repel each other when energized, and a first spring is provided between a side wall of the rack away from the electromagnet and the inner wall of the guide rail on the corresponding side, and the inner wall of the fixed outer rod is fixedly connected to a pressure sensor, and the PLC controller adjusts the power on and off state between the two electromagnets according to the pressure data transmitted by the pressure sensor.

[0011] Preferably, a vibration mechanism is provided between the support plate and the feed barrel for vibrating and feeding parts to avoid accumulation of parts, the vibration mechanism comprises a telescopic ring plate fixedly connected to the upper end of the support plate, the telescopic end of the telescopic ring plate is fixedly connected to the lower end of the feed barrel, a transmission rod is rotatably connected through the support plate, the top end of the transmission rod extends to the upper end of the support plate and is fixedly connected to a rotating plate, two guide wheels are hinged on the rotating plate through a hinge seat, the lower end of the feed barrel is fixedly connected to a guide ring, the lower end of the guide ring is fixedly connected to a plurality of raised blocks distributed in a circular array, the two guide wheels periodically contact and roll with the guide ring and the raised blocks, the lower end of the support plate is also fixedly connected to a third motor, and the third motor drives the transmission rod to rotate through a gear assembly.

[0012] Preferably, an anti-blocking mechanism driven by a vibration mechanism is also provided in the installation frame to prevent parts from being blocked during the feeding process. The anti-blocking mechanism includes two limit rods that penetrate and slide through the side walls of the installation frame, the parts of the two limit rods extending into the installation frame are fixedly connected with anti-blocking push plates, the parts of the two limit rods extending outside the installation frame are fixedly connected with transmission plates, a second spring is provided between the transmission plate and the outer wall of the installation frame, the lower end of the transmission plate is fixedly connected with a push rod, the bottom end of the transmission rod is fixedly connected with a cam, and the cam periodically contacts the push rod and pushes the push rod to move.

[0013] Compared with existing technologies, the advantages of this CCD machine vision inspection equipment are: 1. The present invention sets up a detection mechanism. During the detection process, the first camera is used to photograph the top defects of the parts from top to bottom, the second camera is used to photograph the bottom defects of the parts from bottom to top, and the third camera and the fourth camera are used to photograph the defects around the parts. Subsequently, the processing system processes the image signals transmitted by the first camera, the second camera, the third camera and the fourth camera, thereby realizing comprehensive detection of the parts and improving the production quality of the parts.

[0014] 2. The present invention sets up a lighting combination mechanism. During the detection process, the ambient light in the factory can be detected through a plurality of equally spaced polarizing films, so that the ambient light can be irradiated onto the optical sensors at the corresponding positions through the polarizing films. The PLC controller controls the circuit and algorithm through the electrical signals fed back by the plurality of optical sensors, so that the plurality of light sources on the strip light bar can be freely combined. The intensity and approximate direction of the ambient light irradiation can be detected through the polarized light intensities detected by the plurality of optical sensors and the comparison between the polarized light intensities, and the lighting effects of the plurality of light sources on the components can be adaptively adjusted. Through the coordinated work of the plurality of light sources, the surface illumination of the components can be ensured to be stable and not disturbed by the ambient light, thereby improving the stability of the surface illumination of the components during the detection process, thereby improving the shooting effect and detection accuracy of the components.

[0015] 3. The present invention sets a feed inlet adjustment mechanism. During the detection process, the PLC controller can determine whether the received pressure data electric signal exceeds the set threshold value. When there are too many parts above the transparent glass plate, the weight of the transparent glass plate and the parts above it is too large, and the pressure sensor transmits the received pressure data to the PLC controller through an electric signal. At this time, the transmitted pressure data electric signal exceeds the threshold value set by the PLC controller, so that the circuit where the two electromagnets are located is connected in series with the external power supply, pushing the rack to move on the guide rail, causing the two baffle plates to swing, so that the parts remain on the conveyor belt for a short time, avoiding the continuous feeding of the transparent glass plate and causing the accumulation of parts to worsen, thereby improving the detection accuracy.

[0016] 4. The present invention sets a vibration mechanism. During the detection process, the transmission rod is driven to rotate by the third motor, and the two guide wheels are driven to perform circular motion along the guide ring and the multiple protrusions through the rotating plate, thereby driving the feed barrel to perform reciprocating vertical displacement, thereby realizing vibration feeding of parts. The vibration effect can be introduced during feeding, so that the parts can enter the conveyor belt in a more orderly manner, thereby improving the orderliness of feeding and preventing the parts from being too messy, which affects the detection accuracy.

[0017] 5. The present invention provides an anti-blocking mechanism. During the rotation of the transmission rod, the cam can periodically push the resistance rod, so that the transmission plate can periodically push the parts from above the conveyor belt to prevent the parts from being blocked on the conveyor belt during the feeding process, thereby ensuring the smooth feeding process. At the same time, there is no need to set up an additional driving source, saving costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a three-dimensional structural schematic diagram of the present invention; Figure 2 It is a schematic diagram of the partial structure inside the housing of the device in the present invention; Figure 3 is a partial cross-sectional view of the arc-shaped installation box of the present invention; Figure 4 It is a schematic diagram of the local structure of the installation frame in the present invention; Figure 5 It is a schematic diagram of the local structure of the feed barrel in the present invention.

[0019] In the figure: 1. Equipment housing; 11. Working chamber; 12. Transparent glass plate; 2. Feeding mechanism; 21. Support table; 22. Support plate; 23. Feeding barrel; 24. Mounting frame; 25. Conveying belt; 3. Detection mechanism; 31. First camera; 32. Second camera; 33. Third camera; 34. Fourth camera; 35. NG discharge port; 36. OK discharge port; 37. To-be-detected discharge port; 4. Lighting combination mechanism; 41. Arc-shaped installation box; 42. Polarizer; 43. Optical sensor; 44. Strip light bar; 45. Light source; 46. ​​PLC controller; 5. telescopic rod; 6. feed inlet adjustment mechanism; 61. U-shaped plate; 62. rotating rod; 63. material blocking plate; 64. gear; 65. guide rail; 66. rack; 67. electromagnet; 68. first spring; 7. vibration mechanism; 71. telescopic ring plate; 72. transmission rod; 73. rotating plate; 74. guide wheel; 75. guide ring; 76. raised block; 77. third motor; 8. anti-blocking mechanism; 81. limit rod; 82. anti-blocking push plate; 83. transmission plate; 84. second spring; 85. push rod; 86. cam. DETAILED DESCRIPTION

[0020] The following examples are for illustrative purposes only and are not intended to limit the scope of the present invention.

[0021] Example: Refer to Figures 1 to 5 , a CCD machine vision inspection device, comprising: The device housing 1 has a working chamber 11 formed therein, a transparent glass plate 12 is rotatably connected to the inner bottom wall of the working chamber 11, and a first motor for driving the transparent glass plate 12 is fixedly connected to the device housing 1; The feeding mechanism 2 is used to continuously feed the parts during the inspection process. The feeding mechanism 2 includes a support platform 21 arranged on one side of the equipment housing 1. The upper end of the support platform 21 is fixedly connected to a support plate 22. The upper end of the support plate 22 is fixedly connected to a feeding cylinder 23. A conveyor belt assembly is fixedly connected to the outer wall of one side of the equipment housing 1, which is used to transport the parts in the feeding cylinder 23 to the transparent glass plate 12. The inspection mechanism 3 is used for visual inspection of parts to select qualified parts. The inspection mechanism 3 includes a first camera 31 arranged above the transparent glass plate 12 and a second camera 32 arranged below the transparent glass plate 12. The first camera 31 and the second camera 32 respectively photograph defects of parts from top to bottom and from bottom to top. A third camera 33 and a fourth camera 34 are also arranged above the transparent glass plate 12 at both sides of the first camera 31. The third camera 33 and the fourth camera 34 photograph defects of parts from both sides. An NG discharge port 35, an OK discharge port 36 and a to-be-inspected discharge port 37 are also arranged above the transparent glass plate 12. A processing system for processing image signals transmitted by the first camera 31, the second camera 32, the third camera 33 and the fourth camera 34, and selectively discharging parts from the NG discharge port 35, the OK discharge port 36 and the to-be-inspected discharge port 37; Specifically, the parts discharged from the NG discharge port 35, the OK discharge port 36 and the to-be-inspected discharge port 37 can be respectively dropped into three storage frames to achieve classification of the parts.

[0022] Specifically, the processing system uses a deep learning algorithm and a convolutional neural network (CNN model) to extract image features. During the training phase, a large amount of image data containing various defects (such as scratches, indentations, dirt, oil stains, lack of glue, etc.) and qualified parts are collected to train the CNN model so that the model can learn the image features of parts in different defects and qualified states. During the inspection process, the image data captured by the first camera 31, the second camera 32, the third camera 33 and the fourth camera 34 are transmitted to the processing system in real time. The processing system first pre-processes the image, including grayscale, noise reduction, contrast enhancement and other operations to improve the image quality. Then, the pre-processed image is input into the trained CNN model, and the model outputs the defect judgment result and related dimensional measurement data of the parts in the image. For defect judgment, if the model identifies an area in the image that matches the defect features in the training set, it is determined that the component has the corresponding defect. For component length detection, the boundary of the component is determined by the conversion relationship between the pixels and the actual size set in advance in the image, combined with the edge detection algorithm, and then the length size is calculated and compared with the standard size to determine whether it is qualified; According to the above judgment results, the processing system controls the parts to be discharged from different discharge ports. If all the inspection indicators of the parts are qualified, they are controlled to be discharged from the OK discharge port 36; if there are defects, they are discharged from the NG discharge port 35; for some parts that are difficult to judge clearly and may have the risk of missed inspection, they are discharged from the waiting inspection discharge port 37 for further inspection later.

[0023] In view of the problem that the prior art cannot accurately inspect parts from all directions, resulting in poor comprehensiveness of part inspection, and some unqualified parts may appear unqualified due to incomplete inspection, affecting the production quality of parts, the present invention sets a detection mechanism 3. During the inspection process, the top defects of the parts are photographed from top to bottom by the first camera 31, the bottom defects of the parts are photographed from bottom to top by the second camera 32, and the defects around the parts are photographed by the third camera 33 and the fourth camera 34. Subsequently, the image signals transmitted by the first camera 31, the second camera 32, the third camera 33 and the fourth camera 34 are processed by the processing system to determine whether there are scratches, indentations, dirt, oil stains and other defects on the peripheral surface of the parts, and at the same time, whether the length of the parts is qualified, and the qualified parts are discharged from the OK discharge port 36, and the unqualified parts are discharged from the NG discharge port 35, and some missed parts are discharged from the to-be-inspected discharge port 37, so as to achieve comprehensive inspection of parts and improve the production quality of parts.

[0024] In addition, the area tool can be used to first extract the color of the parts that are not lacking glue, and then the product area can be inspected to determine whether the parts are lacking glue based on the black area detected, further improving the production quality of the parts.

[0025] The illumination combination mechanism 4 is used for flexibly combining the illumination light during the detection process to improve the detection effect of the parts. The illumination combination mechanism 4 includes an arc-shaped installation box 41 arranged above the transparent glass plate 12. The upper arc surface of the arc-shaped installation box 41 is penetrated and fixedly connected with a plurality of equally distributed polarizing plates 42. The inner bottom surface of the arc-shaped installation box 41 is fixedly connected with a plurality of equally distributed optical sensors 43. The plurality of optical sensors 43 correspond to the plurality of polarizing plates 42 one by one. The lower arc surface of the arc-shaped installation box 41 is fixedly connected with a strip light bar 44. The strip light bar 44 is provided with a plurality of equally distributed light sources 45. The outer wall of the equipment housing 1 is fixedly connected with a PLC controller 46.

[0026] Specifically, the first camera 31 , the second camera 32 , the third camera 33 , the fourth camera 34 and the arc-shaped installation box 41 are all fixedly connected to the inner wall of the working chamber 11 .

[0027] Specifically, the PLC controller 46 controls the circuit and algorithm according to the electrical signals fed back by the multiple optical sensors 43 to switch the light source combination among the multiple light sources 45 .

[0028] Specifically, in the illumination combination mechanism 4, after receiving the electrical signal fed back by the optical sensor 43, the PLC controller 46 switches the light source combination through the internally integrated high-speed processing chip and the optimized control circuit. In the program of the PLC controller 46, an interrupt processing mechanism is adopted. When the optical sensor 43 detects a change in ambient light, an interrupt signal is triggered immediately. The PLC controller 46 gives priority to the illumination combination adjustment task to avoid light source switching delays caused by the execution of other tasks. In addition, the control algorithm for light source switching is optimized to pre-judge the trend of ambient light changes in advance, and adjust the light source combination in advance before major changes may occur, thereby further shortening the actual switching time. The light source switching time delay is controlled within 50 milliseconds to ensure that when the ambient light changes rapidly, the illumination on the surface of the component can be adjusted to the appropriate state in time to meet the needs of high-precision detection.

[0029] Specifically, when a beam of light is incident on the polarizer 42, only the polarized light component that is consistent with the transmission axis direction of the polarizer 42 can pass through, and the components in other directions are absorbed or reflected. Since the ambient light is randomly polarized and contains vibration components in various directions, the polarizer 42 can eliminate stray light interference, improve the signal-to-noise ratio, filter out stray light in other directions, and improve the accuracy and resolution of ambient light angle and intensity detection.

[0030] In view of the prior art, the detection equipment is often placed directly in the factory, and the intensity and direction of the ambient light in the factory are prone to change. Such changes in the intensity and direction of the ambient light will cause unstable illumination of the surface of the parts during the detection process, affecting the shooting effect and detection accuracy of the parts. The present invention sets a light combination mechanism 4. During the detection process, the ambient light in the factory can be detected through a plurality of equally distributed polarizing films 42, so that the ambient light can be irradiated on the optical sensor 43 at the corresponding position through the polarizing film 42. The PLC controller 46 controls the circuit and algorithm through the electrical signals fed back by the plurality of optical sensors 43, so that the plurality of light sources 45 on the strip light bar 44 can be freely combined, and the ambient light intensity can be detected through the polarized light intensity detected by the plurality of optical sensors 43 and the comparison between them. The intensity and approximate direction of the radiation. During the daytime, when the ambient light is strongly incident from above, the upper part of the light source 45 is weakened, and the intensity of the side light source 45 is enhanced. When the ambient light is strongly incident from both sides, the part of the light source 45 on both sides is weakened, and the intensity of the upper light source 45 is enhanced. During the night time period, the use of lighting will make the lighting effect effective. The polarized light intensity detected by the multiple optical sensors 43 is relatively low. At this time, the intensity of the multiple light sources 45 is enhanced, so that the lighting effect of the multiple light sources 45 on the parts is adaptively adjusted according to the intensity and angle of the ambient light. Through the coordinated work of the multiple light sources 45, it is ensured that the surface lighting of the parts is stable and not disturbed by the ambient light, thereby improving the stability of the surface lighting of the parts during the detection process, thereby improving the shooting effect and detection accuracy of the parts.

[0031] The transmission belt assembly includes a mounting frame 24 fixedly connected to the outer wall of one side of the equipment housing 1, and two conveyor rollers are rotatably connected inside the mounting frame 24. A conveyor belt 25 is sleeved between the two conveyor rollers. A second motor is fixedly connected to the outer wall of one side of the mounting frame 24. The second motor is used to drive one of the two conveyor rollers to rotate. A synchronous belt assembly is provided between the roller shafts of the two conveyor rollers to drive the two conveyor rollers to rotate synchronously. Here, the synchronous belt assembly can be fixedly connected to the synchronous wheels on the roller shafts of the two conveyor rollers, and a synchronous belt is sleeved between the two synchronous wheels.

[0032] It is worth mentioning that, during use, the parts can be dropped onto the conveyor belt 25 through the feeding barrel 23, and the parts are further conveyed to the transparent glass plate 12 through the continuous movement of the conveyor belt 25, thereby realizing the feeding of the parts.

[0033] The lower end of the transparent glass plate 12 is coaxially fixedly connected with a telescopic rod 5, which is divided into a fixed outer rod and a telescopic inner rod. The telescopic inner rod is fixedly connected to the lower end of the transparent glass plate 12, and the fixed outer rod is fixedly connected to the output end of the first motor.

[0034] A feed inlet adjustment mechanism 6 is also provided above the mounting frame 24, which is used to adjust the subsequent feeding speed of the parts according to the weight of the parts on the transparent glass plate 12. The feed inlet adjustment mechanism 6 includes a U-shaped plate 61 fixedly connected to the upper end of the mounting frame 24, and two symmetrically arranged rotating rods 62 are rotatably connected to the upper wall of the U-shaped plate 61. Each rotating rod 62 extends to a position below the U-shaped plate 61 and is fixedly connected to a material blocking plate 63. Each rotating rod 62 extends to a position above the U-shaped plate 61 and is fixedly connected to a gear 64. The upper end of the U-shaped plate 61 is fixedly connected to Guide rail 65, a rack 66 is connected to the guide rail 65 in a horizontal sliding direction, two gears 64 are respectively meshed with the two sides of the rack 66, the side wall of the rack 66 and the inner wall of the guide rail 65 are fixedly connected with electromagnets 67, the two electromagnets 67 repel each other with the same poles when energized, a first spring 68 is provided between the side wall of the rack 66 away from the electromagnet 67 and the inner wall of the guide rail 65 on the corresponding side, a pressure sensor is fixedly connected to the inner wall of the fixed outer rod, and the PLC controller 46 adjusts the on and off state between the two electromagnets 67 according to the pressure data transmitted by the pressure sensor.

[0035] Taking into account that when there are too many parts on the transparent glass plate 12, blockage may occur, affecting the detection accuracy, the present invention sets a feed inlet adjustment mechanism 6. During the detection process, the PLC controller 46 can determine whether the received pressure data electric signal exceeds the set threshold value. When there are too many parts above the transparent glass plate 12, the weight of the transparent glass plate 12 and the parts above it is too large, and the pressure sensor transmits the received pressure data to the PLC controller 46 through an electric signal. Since the pressure data electric signal transmitted at this time exceeds the threshold value set by the PLC controller 46, the circuit where the two electromagnets 67 are located can be connected in series with the external power supply, so that the two electromagnets 67 are energized to generate magnetism, and under the action of magnetic repulsion, the elastic force of the first spring 68 is overcome to push the rack 66 to move on the guide rail 65, and further drive the rotating rod 62 to rotate through the two gears 64, so that the two baffle plates 63 swing to block the top of the conveyor belt 25, so that the parts are stored in a short time. The parts are retained on the conveyor belt 25 to avoid the aggravation of the accumulation problem of parts caused by continuous feeding to the transparent glass plate 12. During the continuous detection of parts on the transparent glass plate 12, the parts will be selectively discharged through the NG discharge port 35, the OK discharge port 36 and the to-be-detected discharge port 37. The discharge of parts will cause the parts on the transparent glass plate 12 to continue to decrease. After the parts are reduced until the transmitted pressure data electrical signal is less than the threshold value set by the PLC controller 46, it means that there are no more parts on the transparent glass plate 12. At this time, the current of the two electromagnets 67 is disconnected from the external power supply, the two electromagnets 67 are powered off, and the rack 66 is reset under the elastic force of the first spring 68, so that the rotating rod 62 and the baffle plate 63 are reset, thereby continuing to convey the parts in the feed barrel 23 to the transparent glass plate 12 through the conveyor belt 25, which will not affect the normal transportation of the parts, and at the same time effectively prevent the parts from being blocked on the transparent glass plate 12, further improving the detection accuracy.

[0036] A vibration mechanism 7 is provided between the support plate 22 and the feed barrel 23 for vibrating and feeding parts to avoid accumulation of parts. The vibration mechanism 7 includes a telescopic ring plate 71 fixedly connected to the upper end of the support plate 22, and the telescopic end of the telescopic ring plate 71 is fixedly connected to the lower end of the feed barrel 23. A transmission rod 72 is rotatably connected to the support plate 22. The top end of the transmission rod 72 extends to the upper end of the support plate 22 and is fixedly connected to a rotating plate 73. Two guide wheels 74 are hinged on the rotating plate 73 through a hinge seat. A guide ring 75 is fixedly connected to the lower end of the feed barrel 23. A plurality of raised blocks 76 distributed in a circular array are fixedly connected to the lower end of the guide ring 75. The two guide wheels 74 periodically contact and roll with the guide ring 75 and the raised blocks 76. The lower end of the support plate 22 is also fixedly connected to a third motor 77. The third motor 77 drives the transmission rod 72 to rotate through a gear assembly. The gear assembly includes a transmission gear fixedly connected to the output shaft of the third motor 77 and the transmission rod 72, and the two transmission gears are meshed with each other.

[0037] It should be noted that the present invention sets a vibration mechanism 7. During the detection process, the transmission rod 72 is driven to rotate by the third motor 77, and the two guide wheels 74 are driven by the rotating plate 73 to perform circular motion along the guide ring 75 and the plurality of protrusions 76, thereby driving the feed barrel 23 to periodically move upward, and periodically move downward under the action of its own gravity, so that the feed barrel 23 can perform reciprocating vertical displacement, driving the parts in the feed barrel 23 to be continuously fed and further fall on the conveyor belt 25, thereby realizing vibratory feeding of the parts, and being able to introduce the effect of vibration during feeding, so that the parts can enter the conveyor belt 25 in a relatively orderly manner, thereby improving the orderliness of the feeding and preventing the parts from being too messy, which affects the detection accuracy.

[0038] An anti-blocking mechanism 8 driven by the vibration mechanism 7 is also provided in the installation frame 24 to prevent parts from being blocked during the feeding process. The anti-blocking mechanism 8 includes two limit rods 81 that penetrate and slide through the side walls of the installation frame 24. The parts of the two limit rods 81 extending into the installation frame 24 are fixedly connected with an anti-blocking push plate 82, and the parts of the two limit rods 81 extending outside the installation frame 24 are fixedly connected with a transmission plate 83. A second spring 84 is provided between the transmission plate 83 and the outer wall of the installation frame 24. The lower end of the transmission plate 83 is fixedly connected with a push rod 85. The bottom end of the transmission rod 72 is fixedly connected with a cam 86. The cam 86 periodically contacts the push rod 85 and pushes the push rod 85 to move.

[0039] In addition, the present invention provides an anti-blocking mechanism 8. During the rotation of the transmission rod 72, the cam 86 can periodically push the push rod 85, so that the transmission plate 83 periodically approaches the mounting frame 24 and is periodically reset under the elastic force of the second spring 84, so that the anti-blocking push plate 82 can periodically push the parts from above the conveyor belt 25, preventing the parts from being blocked on the conveyor belt 25 during the feeding process, thereby ensuring a smooth feeding process. At the same time, there is no need to provide an additional driving source, saving costs.

[0040] The present invention can be explained by the following operation mode: During the detection process, the third motor 77 is turned on to drive the transmission rod 72 to rotate, and the two guide wheels 74 are driven to perform circular motion along the guide ring 75 and the plurality of protrusions 76 through the rotating plate 73, so that the feed barrel 23 performs reciprocating vertical displacement, driving the parts in the feed barrel 23 to be continuously fed and further fall on the conveyor belt 25, and the second motor is turned on to drive the two conveyor rollers to rotate synchronously through the synchronous belt assembly, and the parts are further conveyed to the transparent glass plate 12 through the continuous movement of the conveyor belt 25; The ambient light in the factory is detected by multiple equally spaced polarizers 42, so that the ambient light can pass through the polarizers 42 and illuminate the optical sensors 43 at the corresponding positions. The PLC controller 46 controls the circuit and algorithm through the electrical signals fed back by the multiple optical sensors 43, so that the multiple light sources 45 on the strip light bar 44 can be freely combined. The intensity and approximate direction of the ambient light are detected through the polarized light intensity detected by the multiple optical sensors 43 and the comparison between them, and the lighting effect of the multiple light sources 45 on the parts is adaptively adjusted; Subsequently, the first camera 31 is used to photograph the top defects of the parts from top to bottom, the second camera 32 is used to photograph the bottom defects of the parts from bottom to top, and the third camera 33 and the fourth camera 34 are used to photograph the defects around the parts. Subsequently, the processing system determines whether there are defects on the peripheral surface of the parts, and at the same time, detects whether the length of the parts is qualified. The qualified parts are discharged from the OK discharge port 36, and the unqualified parts are discharged from the NG discharge port 35, and some parts that have not been inspected are discharged from the uninspected discharge port 37; When there are too many parts on the transparent glass plate 12, the weight of the transparent glass plate 12 and the parts on it is too large, and the pressure sensor transmits the pressure data received to the PLC controller 46 through an electrical signal. The PLC controller 46 connects the circuit where the two electromagnets 67 are located in series with the external power supply, so that the two electromagnets 67 are energized to generate magnetism, pushing the rack 66 to move on the guide rail 65, causing the two baffle plates 63 to swing, blocking the top of the conveyor belt 25, so that the parts remain on the conveyor belt 25 for a short time.

[0041] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A CCD machine vision inspection device, characterized in that: include: A device housing (1), wherein a working chamber (11) is provided inside the device housing (1), a transparent glass plate (12) is rotatably connected to an inner bottom wall of the working chamber (11), and a first motor for driving the transparent glass plate (12) is fixedly connected inside the device housing (1); A feeding mechanism (2) is used for continuously feeding parts during the inspection process, the feeding mechanism (2) comprising a support platform (21) arranged on one side of the device housing (1), the upper end of the support platform (21) is fixedly connected to a support plate (22), the upper end of the support plate (22) is fixedly connected to a feeding barrel (23), and a conveyor belt assembly is fixedly connected to an outer wall of one side of the device housing (1) for conveying parts in the feeding barrel (23) to the transparent glass plate (12); An inspection mechanism (3) is used to perform visual inspection on parts to select qualified parts, the inspection mechanism (3) comprising a first camera (31) arranged above the transparent glass plate (12) and a second camera (32) arranged below the transparent glass plate (12), the first camera (31) and the second camera (32) photographing defects of parts from top to bottom and from bottom to top respectively, a third camera (33) and a fourth camera (34) are also arranged above the transparent glass plate (12) and on both sides of the first camera (31), the third camera (33) and the fourth camera (34) photographing defects of parts from both sides respectively, and an NG discharge port (35), an OK discharge port (36) and a to-be-inspected discharge port (37) are also arranged above the transparent glass plate (12); A processing system for processing image signals transmitted by the first camera (31), the second camera (32), the third camera (33) and the fourth camera (34), and selectively discharging parts from the NG discharge port (35), the OK discharge port (36) and the to-be-inspected discharge port (37); The illumination combination mechanism (4) is used to flexibly combine illumination light during the detection process to improve the detection effect of components.

2. The CCD machine vision inspection device according to claim 1, characterized in that: The illumination assembly mechanism (4) comprises an arc-shaped installation box (41) arranged above the transparent glass plate (12); a plurality of equally spaced polarizing plates (42) are fixedly connected to the upper arc surface of the arc-shaped installation box (41); a plurality of equally spaced optical sensors (43) are fixedly connected to the inner bottom surface of the arc-shaped installation box (41); the plurality of optical sensors (43) correspond to the plurality of polarizing plates (42) in a one-to-one manner; a strip light bar (44) is fixedly connected to the lower arc surface of the arc-shaped installation box (41); a plurality of equally spaced light sources (45) are provided on the strip light bar (44); and a PLC controller (46) is fixedly connected to the outer wall of the device housing (1).

3. The CCD machine vision inspection device according to claim 2, characterized in that: The PLC controller (46) controls the circuit and algorithm according to the electrical signals fed back by the multiple optical sensors (43), and switches the light source combination between the multiple light sources (45).

4. The CCD machine vision inspection device according to claim 2, characterized in that: The transmission belt assembly comprises a mounting frame (24) fixedly connected to an outer wall of one side of a device housing (1); two conveying rollers are rotatably connected inside the mounting frame (24); a conveying belt (25) is sleeved between the two conveying rollers; a second motor is fixedly connected to an outer wall of one side of the mounting frame (24); the second motor is used to drive one of the two conveying rollers to rotate; a synchronous belt assembly is provided between the roller shafts of the two conveying rollers, and is used to drive the two conveying rollers to rotate synchronously.

5. The CCD machine vision inspection device according to claim 4, characterized in that: A telescopic rod (5) is coaxially fixedly connected to the lower end of the transparent glass plate (12); the telescopic rod (5) is divided into a fixed outer rod and a telescopic inner rod; the telescopic inner rod is fixedly connected to the lower end of the transparent glass plate (12); and the fixed outer rod is fixedly connected to the output end of the first motor.

6. The CCD machine vision inspection device according to claim 5, characterized in that: A feed inlet adjustment mechanism (6) is also provided above the mounting frame (24) for adjusting the subsequent feeding speed of the components according to the weight of the components on the transparent glass plate (12). The feed inlet adjustment mechanism (6) comprises a U-shaped plate (61) fixedly connected to the upper end of the mounting frame (24), two symmetrically arranged rotating rods (62) are rotatably connected to the upper wall of the U-shaped plate (61), each of the rotating rods (62) extending to the position below the U-shaped plate (61) is fixedly connected to a material blocking plate (63), each of the rotating rods (62) extending to the position above the U-shaped plate (61) is fixedly connected to a gear (64), and the upper end of the U-shaped plate (61) is fixedly connected to a guide A rack (66) is slidably connected in the horizontal direction inside the guide rail (65), the two gears (64) are respectively meshed with the two sides of the rack (66), the side wall of the rack (66) and the inner wall of the guide rail (65) are fixedly connected with electromagnets (67), the two electromagnets (67) repel each other with the same poles when energized, a first spring (68) is provided between a side wall of the rack (66) away from the electromagnet (67) and the inner wall of the guide rail (65) on the corresponding side, a pressure sensor is fixedly connected to the inner wall of the fixed outer rod, and the PLC controller (46) adjusts the on / off state between the two electromagnets (67) according to the pressure data transmitted by the pressure sensor.

7. The CCD machine vision inspection device according to claim 4, characterized in that: A vibration mechanism (7) is provided between the support plate (22) and the feed barrel (23) for vibrating and feeding parts to avoid accumulation of parts. The vibration mechanism (7) comprises a telescopic ring plate (71) fixedly connected to the upper end of the support plate (22), the telescopic end of the telescopic ring plate (71) being fixedly connected to the lower end of the feed barrel (23), a transmission rod (72) passing through the support plate (22) and being rotatably connected, the top end of the transmission rod (72) extending to the upper end of the support plate (22) and being fixedly connected to a rotating plate (73), Two guide wheels (74) are hingedly connected to the rotating plate (73) via a hinge seat. A guide ring (75) is fixedly connected to the lower end of the feed barrel (23). A plurality of raised blocks (76) distributed in a circumferential array are fixedly connected to the lower end of the guide ring (75). The two guide wheels (74) periodically contact and roll with the guide ring (75) and the raised blocks (76). A third motor (77) is also fixedly connected to the lower end of the support plate (22). The third motor (77) drives the transmission rod (72) to rotate via a gear assembly.

8. The CCD machine vision inspection device according to claim 7, characterized in that: The installation frame (24) is also provided with an anti-blocking mechanism (8) driven by the vibration mechanism (7) for preventing parts from being blocked during the feeding process. The anti-blocking mechanism (8) comprises two limit rods (81) penetrating and slidably connected to the side wall of the installation frame (24). The parts of the two limit rods (81) extending into the installation frame (24) are fixedly connected to an anti-blocking push plate (82). The parts of the two limit rods (81) extending outside the installation frame (24) are fixedly connected to a transmission plate (83). A second spring (84) is provided between the transmission plate (83) and the outer wall of the installation frame (24). The lower end of the transmission plate (83) is fixedly connected to a push rod (85). The bottom end of the transmission rod (72) is fixedly connected to a cam (86). The cam (86) periodically contacts the push rod (85) and pushes the push rod (85) to move.

Images