Visual inspection screening machine

Abstract

The invention relates to a visual inspection screening machine which comprises a rotating table, a feeding mechanism and a screening mechanism. The blocking and correcting unit is erected above the rotating table and used for guiding the products to be conveyed backwards on the rotating table along a specified path; the visual detection unit is erected above the rotating table and is used for shooting and acquiring product image information on the rotating table; the screening unit is located behind the visual detection unit and used for screening qualified products and defective products; the visual detection unit comprises a mounting frame, a plurality of adjusting assemblies are arranged on the mounting frame, a first industrial camera is arranged on each adjusting assembly, and the adjusting assemblies are used for independently controlling the respective first industrial cameras to slide along a specified path. The method has the advantages that shooting requirements of products of different specifications can be met, adjustment is more flexible, and the product recognition accuracy is further improved.

Description

Technical Field

[0001] This application relates to the technical field of detection devices, and in particular to a visual inspection and screening machine. Background Technology

[0002] Currently, visual inspection refers to the process of converting the captured target into an image signal using an industrial camera, transmitting it to a dedicated image processing system, and then converting it into a digital signal based on pixel distribution, brightness, color, and other information. The image system performs various calculations on these signals to extract the target's features, and then controls the operation of on-site equipment based on the judgment results. It is mainly used in production, assembly, or packaging. It plays a crucial role in detecting defects and preventing defective products from being delivered to consumers.

[0003] In related technologies, visual inspection and sorting machines mostly use a single industrial camera when inspecting product quality. The position of the industrial camera is relatively fixed, and it always takes pictures at the same focal length and distance. If adjustments are needed, cumbersome manual adjustment is required. The focusing process is inconvenient, and the focusing accuracy is low, which increases the difficulty of focusing. Summary of the Invention

[0004] This application provides a visual inspection and sorting machine, which can achieve precise focusing of industrial cameras. Each group of industrial cameras adopts independent control of lifting and lowering, which can meet the shooting needs of products of different specifications and achieve more accurate identification.

[0005] The visual inspection and sorting machine provided in this application adopts the following technical solution: A visual inspection and sorting machine includes: a rotary table for carrying and transporting products; a guide unit mounted above the rotary table for guiding products to move backward along a designated path on the rotary table; a visual inspection unit located behind the guide unit and mounted above the rotary table for capturing and acquiring image information of the products on the rotary table; and a screening unit located behind the visual inspection unit for screening qualified products from defective products. The guide unit, visual inspection unit, and screening unit are arranged circumferentially around the rotary table along the feeding direction. The visual inspection unit includes a mounting frame with multiple adjustment components on it. Each adjustment component is equipped with a first industrial camera, and each adjustment component is used to individually control the sliding of its respective first industrial camera along a designated path.

[0006] Preferably, the visual inspection unit further includes a prism mounted on a mounting bracket, the prism corresponding one-to-one with the lens of the first industrial camera.

[0007] Preferably, the adjustment assembly includes a sliding seat mounted on a mounting frame, a slider slidably mounted on the sliding seat, and the first industrial camera mounted on the slider; a first lead screw is also rotatably mounted on the mounting frame, the slider movably passes through the outside of the first lead screw, and the slider is threadedly connected to the first lead screw; the first lead screw is used to drive the first industrial camera to slide along the length direction of the first lead screw; the adjustment assembly further includes a first motor mounted on the mounting frame for driving the first lead screw to rotate.

[0008] Preferably, the mounting frame is provided with a lifting rod, the adjusting components are arranged circumferentially around the lifting rod, and the lifting rod is provided with a lighting fixture facing the rotary table.

[0009] Preferably, a transparent glass disk is provided on the rotating platform, and the product is placed on the transparent glass disk; it also includes a second industrial camera located below the transparent glass disk, with the lens of the second industrial camera facing the bottom of the transparent glass disk.

[0010] Preferably, a horizontal detection unit is provided between the visual inspection unit and the screening unit. The horizontal detection unit includes a horizontal drive component and a third industrial camera disposed at the movable end of the horizontal drive component. The movable end of the horizontal drive component is used to drive the third industrial camera to slide horizontally. The lens of the third industrial camera faces the rotary table.

[0011] Preferably, a vertical detection unit is provided between the horizontal detection unit and the screening unit, mounted above the rotary table. The vertical detection unit includes a vertical drive component and a fourth industrial camera disposed at the movable end of the vertical drive component. The movable end of the vertical drive component is used to drive the fourth industrial camera to slide vertically. The lens of the fourth industrial camera is vertically oriented towards the rotary table below.

[0012] Preferably, the screening unit includes a plurality of blowing nozzles, which are arranged sequentially along the feeding direction of the rotary table; the airflow ejected from the blowing nozzles is used to blow the product off the rotary table.

[0013] Preferably, it also includes: a position detection unit, located between the alignment unit and the vision detection unit, mounted above the rotary table, for identifying and recording the position of the product on the rotary table.

[0014] In summary, this application includes at least one of the following beneficial technical effects: Since each set of first industrial cameras is independently controlled by its own adjustment components, it can meet the shooting needs of products of different specifications, realize the automatic focusing of the first industrial camera, improve the focusing accuracy, reduce the focusing difficulty, make the adjustment more flexible, and further improve the product recognition accuracy. The outermost blowing nozzle, furthest from the vertical detection unit, is in a normally open state to blow away residual impurities on the transparent glass disc, ensuring the cleanliness of the transparent glass disc surface and reducing interference with the detection results.

[0015] When the transparent glass disc rotates a qualified product to a position below the qualified blowing nozzle, the corresponding qualified blowing nozzle blows the qualified product from the transparent glass disc into the qualified material channel. If the product is determined to be defective, the defective product blowing nozzle blows the defective product into the defective product channel. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application; Figure 2 yes Figure 1 A top-view diagram of a partial structure; Figure 3 yes Figure 2 A schematic diagram of the local structure from another perspective; Figure 4 This is a schematic diagram highlighting a local structure of the visual inspection unit; Figure 5 This is a schematic diagram highlighting a partial structure of the screening unit; Figure 6 This is a partial structural diagram highlighting the horizontal and vertical detection units; Figure 7 This is a schematic diagram highlighting a partial structure of the screening unit.

[0017] Explanation of reference numerals in the attached drawings: 1. Rotary table; 10. Transparent glass disc; 2. Alignment unit; 20. Alignment frame; 21. Stopper; 22. Alignment motor; 3. Vision inspection unit; 30. Mounting bracket; 31. Adjustment assembly; 32. First industrial camera; 33. Prism; 34. Sliding seat; 35. Slider; 36. First lead screw; 37. First motor; 38. Lifting rod; 39. Lighting fixture; 4. Screening unit; 40. Air nozzle; 41. Qualified material channel; 42. Defective product channel; 5. Second industrial camera; 6. Horizontal inspection unit; 60. Horizontal drive component; 600. Horizontal support; 61. Third industrial camera; 62. Second lead screw; 63. Horizontal sliding component; 7. Vertical inspection unit; 70. Vertical drive component; 71. Fourth industrial camera; 8. Position inspection unit; 80. Inspection frame. Detailed Implementation

[0018] The present application will be further described in detail below with reference to the accompanying drawings.

[0019] This application discloses a visual inspection and screening machine.

[0020] Reference Figure 1, Figure 2 The visual inspection and sorting machine includes a rotary table 1, a baffle unit 2, a visual inspection unit 3, and a screening unit 4. The baffle unit 2, the visual inspection unit 3, and the screening unit 4 are arranged circumferentially around the rotary table 1 along the feeding direction of the rotary table 1.

[0021] like Figure 2 , Figure 3 As shown, the rotary table 1 is controlled by a motor to rotate. A transparent glass disc 10 is coaxially fixed on the top of the rotary table 1. The outer diameter of the transparent glass disc 10 is larger than the outer diameter of the rotary table 1. The transparent glass disc 10 is used to carry and transport products circumferentially. The transparent glass disc 10 is transparent to light. Multiple lamps are installed below the transparent glass disc 10, arranged sequentially along the feeding direction. The lamps are used to illuminate the products on the transparent glass disc 10, thereby enabling the vision inspection unit 3 to obtain clearer image information.

[0022] The central processing unit (CPU) can include a CPU or MPU, or a host system built around a CPU or MPU, comprising hardware or software. Users can freely control the rotary table 1, the alignment unit 2, the vision inspection unit 3, and the sieving unit 4 using programming, making them operate according to their wishes. Local measurement / traceability components, remote measurement / traceability components, and remote communication components can also be controlled through internal protocols. Internal protocols may include some or all of the following: human-machine interface protocols, software / hardware (interface) protocols, chip bus (C-Bus) protocols, and internal bus (I-Bus) protocols. With the development of integrated circuit technology, some protocols belonging to external bus (E-Bus) have also become internal protocols after being integrated into the chip. All of the above are controlled by the central processing unit.

[0023] like Figure 2 , Figure 3 As shown, the alignment unit 2 includes an alignment frame 20, on which a stop member 21 is rotatably mounted above the transparent glass disc 10. The rotation axis of the stop member 21 is aligned with the rotation axis of the rotary table 1. A dial wheel is formed at the bottom of the stop member 21, and the dial wheel is in contact with the upper surface of the transparent glass disc 10. The dial wheel is used to guide the product to move backward along a designated path on the transparent glass disc 10, thereby achieving the function of aligning the product.

[0024] like Figure 2 , Figure 3 As shown, the straightening unit 2 also includes a straightening motor 22 mounted on the straightening frame 20. The output shaft of the straightening motor 22 is linked to the rotation shaft of the shifting component 21 by a belt. After the straightening motor 22 is started, the shifting component 21 will rotate synchronously with the output shaft of the straightening motor 22 under the drive of the belt.

[0025] like Figure 2 , Figure 3 As shown, a position detection unit 8 is provided between the alignment unit 2 and the vision detection unit 3. The position detection unit 8 includes a detection frame 80 mounted on the rotating table 1. A position sensor is installed on the detection frame 80. The position sensor establishes signal communication with the central processing unit and is controlled by the central processing unit. The position sensor is used to identify and record the position of the product on the transparent glass disc 10.

[0026] like Figure 3 , Figure 4 As shown, the visual inspection unit 3 is used to capture and acquire product image information on the transparent glass disc 10 in real time. The visual inspection unit 3 includes a mounting frame 30, on which multiple adjustment components 31 are mounted above the transparent glass disc 10. In this embodiment, the number of adjustment components 31 is four, and the adjustment components 31 are arranged in a circumferential ring.

[0027] like Figure 3 , Figure 4 As shown, the adjustment assembly 31 includes a sliding seat 34 fixedly mounted on the mounting bracket 30. A slider 35 is vertically mounted on the sliding seat 34. A vertically positioned first lead screw 36 is also rotatably mounted on the mounting bracket 30. The slider 35 is movably inserted through the first lead screw 36 and is threadedly connected to the first lead screw 36. The adjustment assembly 31 also includes a first motor 37 fixedly mounted on the top of the mounting bracket 30. The output shaft of the first motor 37 is coaxially fixedly connected to the first lead screw 36. The first motor 37 drives the first lead screw 36 to rotate, and the rotation of the first lead screw 36 drives the slider 35 to slide vertically along the length of the first lead screw 36.

[0028] like Figure 3 , Figure 4 As shown, a first industrial camera 32 is fixedly mounted on the slider 35. The lens of the first industrial camera 32 is vertically oriented downwards towards the transparent glass disk 10. The first industrial camera 32 is used to capture and acquire image information of each product on the transparent glass disk 10 in real time, and transmit the acquired product image information back to the central processing unit in real time. The adjustment component 31 is used to individually control the sliding of each first industrial camera 32 along a specified path.

[0029] The first motor 37 is controlled by the central processing unit. Since each group of first industrial cameras 32 is independently controlled by its own adjustment component 31 to raise and lower, it can meet the shooting needs of products of different specifications, realize the automatic focusing of the first industrial camera 32, improve the focusing accuracy, reduce the focusing difficulty, and further improve the product recognition accuracy.

[0030] like Figure 3 , Figure 4As shown, the vision inspection unit 3 also includes four sets of prisms 33 disposed at the bottom of the mounting bracket 30, each set of prisms 33 corresponding to the lens of the first industrial camera 32 above. The prisms 33 are fixed to the mounting bracket 30 by bolts. After the bolts are released from locking the prisms 33, the reflection angle of the prisms 33 can be adjusted by rotating them. The prisms 33 are mainly used for adjusting the optical path and changing the direction of light. They can turn the light path at a specific angle so that the light can be correctly guided to the first industrial camera 32.

[0031] like Figure 3 , Figure 4 As shown, a lifting rod 38 is also provided on the mounting frame 30. The adjustment component 31 is arranged circumferentially around the lifting rod 38. An illumination lamp 39 facing the transparent glass disk 10 is fixedly installed at the bottom of the lifting rod 38. The lifting rod 38 can be raised and lowered by a cylinder installed on the mounting frame 30. The illumination lamp 39 is used to provide illumination for the product on the transparent glass disk 10 to ensure that the first industrial camera 32 can obtain clearer image information.

[0032] like Figure 5 , Figure 6 As shown, it also includes a second industrial camera 5 positioned below the transparent glass disk 10. The lens of the second industrial camera 5 faces the bottom of the transparent glass disk 10. The second industrial camera 5 is used to acquire image information from the bottom view of the product in real time and transmit the acquired image information back to the central processing unit in real time. The second industrial camera 5 is detachably mounted on the support base using fasteners such as bolts. When the fasteners are released, the position of the second industrial camera 5 can be adjusted up and down along the height of the support base, thereby ensuring accurate focusing of the second industrial camera 5.

[0033] like Figure 5 , Figure 6As shown, a horizontal detection unit 6 is disposed between the vision inspection unit 3 and the screening unit 4, and the horizontal detection unit 6 is also controlled by the central processing unit. The horizontal detection unit 6 includes a horizontal drive component 60, a horizontal support 600, and a third industrial camera 61 fixedly mounted on the movable end of the horizontal drive component 60. The horizontal drive component 60 includes a second lead screw 62 rotatably disposed on the horizontal support 600, the length of the second lead screw 62 being set in the horizontal direction. The horizontal drive component 60 also includes a horizontal sliding component 63 movably disposed on the horizontal support 600, the horizontal sliding component 63 passing through the outside of the second lead screw 62 and threadedly connected to the second lead screw 62. The third industrial camera 61 is fixedly mounted on the outside of the horizontal sliding component 63, the lens of the third industrial camera 61 being horizontally placed and facing the transparent glass disk 10. The horizontal drive component 60 also includes a servo motor fixedly mounted on the horizontal support 600, the servo motor being coaxially fixedly mounted on the end of the second lead screw 62. A servo motor is used to drive the second lead screw 62 to rotate, and as the second lead screw 62 rotates, it controls the third industrial camera 61 to slide horizontally along the length direction of the second lead screw 62.

[0034] like Figure 5 , Figure 6 As shown, a vertical detection unit 7 is also provided between the horizontal detection unit 6 and the screening unit 4, mounted above the rotary table 1. The vertical detection unit 7 is controlled by the central processing unit. The vertical detection unit 7 includes a vertical drive unit 70 and a fourth industrial camera 71 located at the movable end of the vertical drive unit 70. The driving method of the vertical drive unit 70 is the same as that of the horizontal drive unit 60, and will not be described again here. The movable end of the vertical drive unit 70 is used to drive the fourth industrial camera 71 to slide up and down in the vertical direction, and the lens of the fourth industrial camera 71 is vertically facing the transparent glass disk 10 below, with the lens of the fourth industrial camera 71 directly facing the product on the transparent glass disk 10.

[0035] like Figure 6 , Figure 7 As shown, the screening unit 4 is located behind the vertical detection unit 7 and is controlled by the central processing unit. The screening unit 4 is used to screen qualified products from defective products. The screening unit 4 includes multiple blowing nozzles 40 arranged at intervals along the feeding direction of the rotary table 1. The air inlets of the blowing nozzles 40 are connected to the air compressor through air pipes. The airflow ejected from the blowing nozzles 40 is used to blow the products off the rotary table 1. In this embodiment, two blowing nozzles 40 are used to screen qualified products, one blowing nozzle 40 is used to screen defective products, and the outermost blowing nozzle 40, which is furthest from the vertical detection unit 7, is in a normally open state to blow away residual impurities on the transparent glass disk 10, so as to ensure the cleanliness of the surface of the transparent glass disk 10 and reduce interference with the detection results.

[0036] The central processing unit (CPU) analyzes and processes image data transmitted from various industrial cameras for the same product, extracting useful information or features such as edges, colors, and textures from the images using various algorithms. These features are crucial for distinguishing between acceptable and unacceptable products. Based on the extracted features, machine learning algorithms or pre-defined standards are used to classify or evaluate the objects, determining whether defects exist or whether they meet specifications. After identifying defects or measuring dimensions, the CPU outputs the corresponding judgment result based on the processed data.

[0037] The central processing unit stores the position parameter values ​​of industrial cameras corresponding to different inspected products. Based on the product image information acquired by the industrial cameras, it automatically controls the corresponding drive components to move each group of industrial cameras to the designated position and complete autofocus. This facilitates switching to other screening items, and the cameras automatically return to the corresponding position upon startup. The internal storage components can be RAM, ROM, EPROM, EEPROM, FLASH, disk, optical disk, or other storage devices. The internal storage components can store parameters and algorithms that need to be modified or corrected after the measuring instrument has undergone calibration, self-calibration, self-testing, verification, and adjustment processes, allowing for easy retrieval by subsequent programs. It can also store measurement data generated during normal operation of the local measurement transmission / traceability components, as well as data from the local measurement transmission / traceability components' measurement transmission / traceability of external measuring devices.

[0038] like Figure 7 As shown, if the product is determined to be qualified, when the transparent glass disc 10 rotates the qualified product to below the qualified blowing nozzle 40, the corresponding qualified blowing nozzle 40 blows the qualified product from the transparent glass disc 10 into the qualified material channel 41. If the product is determined to be defective, the defective product blowing nozzle 40 blows the defective product into the defective product material channel 42.

[0039] The implementation principle is as follows: Since each group of first industrial cameras 32 is independently controlled for lifting and lowering by its own adjustment component 31, it can meet the shooting needs of products of different specifications, realize automatic focusing of the first industrial camera 32, improve the focusing accuracy, reduce the focusing difficulty, make the adjustment more flexible, and further improve the product recognition accuracy. Two blowing nozzles 40 are used to screen qualified products, and one blowing nozzle 40 is used to screen defective products. The outermost blowing nozzle 40, which is farthest from the vertical detection unit 7, is in a normally open state to blow away residual impurities on the transparent glass disk 10, so as to ensure the cleanliness of the surface of the transparent glass disk 10 and reduce interference with the detection results.

[0040] If the product is determined to be qualified, when the transparent glass disc 10 rotates the qualified product to below the qualified blowing nozzle 40, the corresponding qualified blowing nozzle 40 blows the qualified product from the transparent glass disc 10 into the qualified material channel 41. If the product is determined to be defective, the defective product blowing nozzle 40 blows the defective product into the defective product material channel 42.

[0041] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A visual inspection and sorting machine, characterized in that, Including: Rotary table (1), used for carrying and transporting products; The guide unit (2) is mounted above the rotary table (1) and is used to guide the product to be transported backward along a specified path on the rotary table (1); The visual inspection unit (3) is located behind the blocking unit (2) and mounted above the rotating table (1) for capturing and acquiring product image information on the rotating table (1); The screening unit (4) is located behind the visual inspection unit (3) and is used to screen qualified products from defective products. The blocking unit (2), the visual inspection unit (3) and the screening unit (4) are arranged circumferentially around the rotary table (1) along the feeding direction of the rotary table (1); The visual inspection unit (3) includes a mounting frame (30), on which a plurality of adjustment components (31) are provided. Each adjustment component (31) is provided with a first industrial camera (32). The adjustment component (31) is used to individually control each first industrial camera (32) to slide along a specified path.

2. The visual inspection and sorting machine according to claim 1, characterized in that: The visual inspection unit (3) also includes a prism (33) mounted on the mounting bracket (30), and the prism (33) corresponds one-to-one with the lens of the first industrial camera (32).

3. The visual inspection and sorting machine according to claim 2, characterized in that: The adjustment assembly (31) includes a sliding seat (34) disposed on the mounting frame (30), a slider (35) slidably disposed on the sliding seat (34), and the first industrial camera (32) disposed on the slider (35); a first lead screw (36) is also rotatably disposed on the mounting frame (30), the slider (35) is movably disposed outside the first lead screw (36), and the slider (35) is threadedly connected to the first lead screw (36); the first lead screw (36) is used to drive the first industrial camera (32) to slide along the length direction of the first lead screw (36); the adjustment assembly (31) also includes a first motor (37) disposed on the mounting frame (30) for driving the first lead screw (36) to rotate.

4. The visual inspection and sorting machine according to claim 1, characterized in that: The mounting bracket (30) is provided with a lifting rod (38), the adjustment component (31) is arranged circumferentially around the lifting rod (38), and the lifting rod (38) is provided with a lighting fixture (39) facing the rotating table (1).

5. The visual inspection and sorting machine according to claim 4, characterized in that: The rotating table (1) is provided with a transparent glass disk (10) for placing products on the transparent glass disk (10); it also includes a second industrial camera (5) located below the transparent glass disk (10), with the lens of the second industrial camera (5) facing the bottom of the transparent glass disk (10).

6. The visual inspection and sorting machine according to claim 1, characterized in that: A horizontal detection unit (6) is provided between the visual inspection unit (3) and the screening unit (4). The horizontal detection unit (6) includes a horizontal drive (60) and a third industrial camera (61) disposed at the movable end of the horizontal drive (60). The movable end of the horizontal drive (60) is used to drive the third industrial camera (61) to slide in the horizontal direction. The lens of the third industrial camera (61) faces the rotary table (1).

7. The visual inspection and sorting machine according to claim 6, characterized in that: A vertical detection unit (7) is provided between the horizontal detection unit (6) and the screening unit (4) and is mounted above the rotary table (1). The vertical detection unit (7) includes a vertical drive (70) and a fourth industrial camera (71) disposed at the movable end of the vertical drive (70). The movable end of the vertical drive (70) is used to drive the fourth industrial camera (71) to slide in the vertical direction. The lens of the fourth industrial camera (71) is vertically oriented towards the rotary table (1) below.

8. The visual inspection and sorting machine according to claim 1, characterized in that: The screening unit (4) includes multiple blowing nozzles (40), which are arranged sequentially along the feeding direction of the rotary table (1); the airflow ejected by the blowing nozzles (40) is used to blow the product off the rotary table (1).

9. The visual inspection and sorting machine according to claim 1, characterized in that, It also includes: The position detection unit (8) is located between the alignment unit (2) and the vision detection unit (3) and is mounted above the rotary table (1) to identify and record the position of the product on the rotary table (1).

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