Plastic product defect detection device based on machine vision

Abstract

The invention relates to the technical field of industrial visual inspection, in particular to a plastic product defect detection device based on machine vision, which comprises a rack, industrial visual inspection equipment is mounted on the rack, surrounding type conveying equipment is mounted on the rack, a vertical rod is fixed on the rack, and a rack is fixed at the top end of the vertical rod; wherein a plurality of clamping assemblies are arranged on the surrounding type conveying equipment and used for clamping plastic bottles, each clamping assembly is composed of an overturning structure and a clamping structure, each clamping structure is composed of a triggering part and a clamping part, the clamping part comprises two clamping pieces, and the two clamping pieces are arranged on the overturning structure. The two clamping pieces are both arranged on the peripheral face of the clamping base. According to the invention, the plastic bottle is dynamically rotated, and a single CDD camera is used for multiple times of photographing, so that all-directional defect detection is realized, the problems of high cost and complex calibration of multi-camera layout are avoided, the hardware structure is simplified, and the equipment investment and maintenance cost are reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of industrial visual inspection, and in particular to a plastic product defect detection device based on machine vision. Background Art

[0002] The plastic bottle defect detection device based on industrial vision inspection technology is an automated inspection system that integrates image acquisition, processing and intelligent analysis. It uses machine vision technology to achieve efficient and accurate identification of surface and structural defects in the plastic bottle production process.

[0003] After searching, the Chinese patent with the announcement number CN222994347U discloses an automatic visual inspection device for defects in plastic bottles, which includes a workbench, a conveyor belt is provided inside the workbench, a fixed seat is fixedly connected to the front and rear ends of the workbench, the top of the fixed seat is rotatably connected to a mounting frame, the mounting frame is rotatably connected to the conveyor belt and the workbench respectively, a handle is fixedly connected to the top of the mounting frame, a guide wheel is hinged inside the mounting frame, and the top of the workbench is in contact with a bracket. The above scheme can transport plastic bottles by designing the function of the conveyor belt. When the plastic bottles are transported through the CDD camera, the CDD camera can photograph the plastic bottles to realize automatic visual inspection of defects in the plastic bottles. Through the function of the motor, the output end of the motor can drive the screw to rotate, which can realize the threaded movement of the bracket. The bracket can drive the CDD camera to move in the vertical direction, which is convenient for adjusting the shooting height and has better applicability. However, the above scheme still has the following shortcomings in actual use: In order to ensure all-round industrial inspection of plastic bottles, the above-mentioned device is equipped with at least three CCD cameras for inspection. Although the accuracy of all-round inspection of plastic bottles can be improved by deploying at least three CCD cameras, there are multiple disadvantages: the hardware cost increases significantly with the increase in the number of cameras, and multiple sets of light sources, lenses and image acquisition cards need to be configured synchronously, resulting in high initial investment and subsequent maintenance costs; the collaboration of multiple cameras requires resolving spatial layout conflicts, and the complex optical path design is prone to occlusion or reflection interference, and the parameters of each camera need to be precisely calibrated to ensure image stitching consistency, which increases the difficulty of system integration; multi-channel data parallel processing places higher requirements on computing resources, and it may be necessary to upgrade the server or adopt a distributed architecture, further pushing up equipment costs and energy consumption.

[0004] Based on this, the present invention discloses a plastic product defect detection device based on machine vision. Summary of the Invention

[0005] To address the problem in the background art that achieving omnidirectional inspection using multiple CCD cameras improves accuracy, but significantly reduces overall cost effectiveness and maintainability due to surging hardware costs, complex optical path design, high consumption of computing resources, and decreased system stability, the present invention provides a plastic product defect inspection device based on machine vision, comprising a frame, on which is mounted industrial visual inspection equipment, a wraparound conveying device, a vertical rod fixed to the frame, and a rack fixed to the top of the vertical rod; The wrap-around conveying device is provided with a plurality of clamping assemblies for clamping plastic bottles. Each of the clamping assemblies is composed of a flip structure and a clamping structure. Each of the clamping structures is composed of a trigger portion and a clamping portion. The clamping portion includes two clamping members, and the two clamping members are arranged on the outer peripheral surface of the clamping seat. The trigger part includes a clamping seat, a cavity is provided inside the clamping seat, a sliding plug is sealingly and slidably connected to the cavity, a push rod is fixed to the sliding plug, and the sliding plug and the cavity are connected by a spring, a groove is provided on the side of the clamping seat, an air supply pipe is arranged in the groove, one end of the air supply pipe is connected to the cavity, and an opening is provided at the top of the clamping seat, and the opening is connected to the cavity; This technical solution uses a clamping part to clamp the plastic bottle, which can realize automatic flipping, rotation and rejection of the plastic bottle; As a further improvement of the present technical solution, the flipping structure includes a mounting frame, which is fixed on the annular conveyor belt of the wrap-around conveying equipment. A first servo motor is installed on the mounting frame, and a swing frame is fixed on the output shaft of the first servo motor. A hole is opened on the swing frame, and a rotating shaft is rotatably installed in the hole. A rotating frame is fixed to one end of the rotating shaft, and a gear is fixed to the other end. The swing frame and the rotating frame are both U-shaped structures, and the clamping seat is fixed on the rotating frame.

[0006] On this basis, in order to allow the plastic bottle to rotate during the detection process, this solution uses a first servo motor to drive the rotating frame to rotate, thereby driving the plastic bottle to rotate.

[0007] As a further improvement of the present technical solution, the trigger part also includes an elastic bag and a movable block. The movable block is placed above the clamping seat, and the movable block is arranged opposite the opening. One end of the elastic bag is connected to the clamping seat, and the other end is connected to the movable block.

[0008] In another solution, in order to realize automatic clamping of plastic bottles, this solution adopts a movable block as a driving part.

[0009] As a further improvement of the present technical solution, each of the clamping members includes two side plates, both of which are fixed on the outer peripheral surface of the clamping seat, and the two side plates are arranged opposite each other, a slidable magnetic slide is provided between the two side plates, the magnetic slide is connected to the clamping seat by a tension spring, and limiting openings are provided on the two side plates, two limiting blocks are fixed on the magnetic slide, and the two limiting blocks slide in the two limiting openings respectively, a clamping strip is adsorbed on the magnetic slide, and the clamping strip consists of a clamping part and a driving part, the driving part is fixed to the top end of the clamping part, and an inclined surface is provided on the driving part, and the clamping part is used to support the bottle mouth of the plastic bottle.

[0010] In order to ensure the stability of the movement of the magnetic slide, this solution uses two limit ports and two limit blocks to provide it with limit; As a further improvement of the present technical solution, a first exhaust hole is provided on the bottom surface of the clamping seat, a rotatable blocking plate is provided on the bottom surface of the clamping seat, and the blocking plate is rotatably connected to the clamping seat through a hinge, the blocking plate is arranged opposite the first exhaust hole, a torsion spring is provided on the hinge, a second exhaust hole is provided on the outer circumference of the clamping seat, a movable blocking ring is sleeved on the outer circumference of the clamping seat, a limiting protrusion is further fixed on the outer circumference of the clamping seat, the limiting protrusion provides a limit for the blocking ring, and when the blocking ring falls on the limiting protrusion, the blocking ring is arranged opposite the second exhaust hole; Two limiting lips are fixed on the outer peripheral surface of the clamping seat, and the two limiting lips together provide constraints for the plastic bottle. Pulling parts are provided on the two limiting lips.

[0011] As a further improvement of the present technical solution, when the gas is discharged through the first exhaust hole, the device removes unqualified plastic bottles, and when the gas is discharged through the second exhaust hole, the device collects qualified plastic bottles.

[0012] As a further improvement of the present technical solution, the pulling part includes a second servo motor, which is installed on the limiting lip. The output shaft of the second servo motor is fixed with an eccentric wheel, and a fixed rod is fixed on the side of the eccentric wheel, and the fixed rod is located at the edge of the eccentric wheel. A rotating ring is provided on the rotating sleeve of the fixed rod, and a pull rope is connected to the rotating ring. For the two pull ropes, one of the pull ropes is connected to the blocking plate, and the other pull rope is connected to the blocking ring.

[0013] As a further improvement of the present technical solution, a non-slip pad is bonded to the side surface of the clamping portion.

[0014] As a further improvement of the present technical solution, the push rod is arranged opposite to the opening.

[0015] As a further improvement of the present technical solution, the magnetic slide plate and the clamping bar are both made of magnetic materials.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. By dynamically rotating the plastic bottle and taking multiple photos with a single CDD camera, all-round defect detection is achieved, avoiding the high cost and complex calibration issues of a multi-camera layout, simplifying the hardware structure, significantly improving detection efficiency, and reducing equipment investment and maintenance costs.

[0017] 2. The device integrates automatic clamping, flipping, rotation and defective product rejection functions. During the inspection process, the plastic bottles can automatically adjust their posture and complete the inspection. Qualified products and defective products are automatically classified and collected, reducing manual intervention and improving the automation level of the production line.

[0018] 3. The use of gas control responds quickly and accurately, and can quickly realize the start and reset of the clamping structure, the rejection of defective products and the collection of qualified products, greatly improving the detection efficiency. Using gas as the power source avoids the complex mechanical transmission structure, making the overall structure of the device simpler, reducing the probability of equipment failure and maintenance costs. The gas control method is highly flexible and can flexibly adjust gas pressure, flow and other parameters according to different specifications of plastic bottles and actual production needs, so as to achieve stable and reliable clamping of various plastic bottles, accurate rejection of defective products and efficient collection of qualified products. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The overall structure of the present invention is shown in FIG. Figure 1 ; Figure 2 for Figure 1 A magnified view of the structure at point A; Figure 3 The overall structure of the present invention is shown in FIG. Figure 2 ; Figure 4 Schematic diagram of the clamping assembly Figure 1 ; Figure 5 Schematic diagram of the clamping assembly Figure 2 ; Figure 6 for Figure 5 A magnified view of the structure at point B; Figure 7 Schematic diagram of the clamping assembly Figure 3 ; Figure 8 for Figure 7 A magnified view of the structure at point C; Figure 9 is a cross-sectional view of the clamping assembly; Figure 10This is the state diagram of the clamping component clamping the plastic bottle; Figure 11 Schematic diagram of the rotation of a plastic bottle.

[0020] The meaning of each number in the figure is: 11. Frame; 111. Vertical bar; 112. Rack; 12. Industrial visual inspection equipment; 13. Wraparound conveyor; 21. Mounting frame; 22. First servo motor; 23. Swing frame; 24. Rotating frame; 25. Rotating shaft; 26. Gear; 31. Clamping seat; 311. Limiting lip; 312. First exhaust hole; 3121. Blocking plate; 313. Second exhaust hole; 3131. Blocking ring; 3132. Limiting bump; 314 , opening; 315, slot; 316, air supply pipe; 32, cavity; 33, slide plug; 34, push rod; 35, spring; 41, elastic bag; 42, movable block; 51, side plate; 52, magnetic slide; 53, limit opening; 54, limit block; 551, clamping part; 552, driving part; 553, anti-slip pad; 56, tension spring; 61, second servo motor; 62, eccentric wheel; 63, fixing rod; 64, rotating ring; 65, pull rope. DETAILED DESCRIPTION

[0021] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0022] Existing industrial visual inspection devices use multiple CCD cameras to achieve all-round inspection, which improves accuracy. However, the overall economy and maintainability are significantly reduced due to the surge in hardware costs, complex optical path design, high consumption of computing resources and decreased system stability.

[0023] To this end, the present invention provides a plastic product defect detection device based on machine vision, see Figure 1As shown, it includes a frame 11, on which is installed an industrial visual inspection device 12 for performing industrial visual inspection on plastic bottles. The industrial visual inspection device 12 uses a CDD camera to quickly capture the surface or internal image of the target object, and then the image processing unit pre-processes the original data (such as noise reduction and contrast enhancement), and then uses a feature extraction algorithm to identify key information (such as size, shape, and defect location). Finally, the intelligent analysis module performs comparison and judgment in combination with preset standards. The specific working principle of the device is the existing technology and will not be described in detail here. A surround conveying device 13 is installed on the frame 11 for conveying plastic bottles. The specific structure and working principle of the conveying device are the existing technology and will not be described in detail here. In the process of transporting plastic bottles by the surround conveying device 13, the plastic bottles will pass one by one directly under the industrial visual inspection device 12, and the industrial visual inspection device 12 will perform visual inspection and identification on the plastic bottles; See also Figure 4-Figure 9 As shown, the wrap-around conveying device 13 is provided with a plurality of clamping assemblies for clamping the plastic bottles. Each clamping assembly is composed of a flip structure and a clamping structure. Each clamping structure is composed of a trigger part, a clamping part 551 and two pulling parts. The flip structure includes a mounting frame 21, which is fixed on the endless conveyor belt of the wrap-around conveying device 13. A first servo motor 22 is installed on the mounting frame 21, and a swing frame 23 is fixed on the output shaft of the first servo motor 22. A hole is opened on the swing frame 23, and a rotating shaft 25 is rotatably installed in the hole. A rotating frame 24 is fixed to one end of the rotating shaft 25, and a gear 26 is fixed to the other end. The swing frame 23 and the rotating frame 24 are both U-shaped structures. The first servo motor 22 can drive the swing frame 23 to rotate, and the rotating frame 24 can rotate around the rotating shaft 25. A vertical rod 111 is fixed on the frame 11, and a rack 112 is fixed to the top of the vertical rod 111. The rack 112 is arranged in the horizontal direction. When the wrap-around conveying device 13 is running, a plurality of mounting frames 21 move accordingly; In the initial state, the U-shaped openings of the swing frame 23 and the rotating frame 24 are both facing downward. At this time, the plastic bottles are clamped and kept in a vertical state. Before the mounting frame 21 passes through the inspection area of ​​the industrial visual inspection equipment 12, the first servo motor 22 runs and drives the swing frame 23 to rotate until the swing frame 23 rotates 90 degrees. When the swing frame 23 rotates, the plastic bottles on it rotate accordingly and rotate to a horizontal state. Figure 11As shown, the process of the plastic bottle rotating from a vertical state to a horizontal state, when the mounting frame 21 passes through the detection area of ​​the industrial vision inspection equipment 12, the gear 26 will mesh with the rack 112 and rotate under the action of the rack 112. When the gear 26 rotates, it can drive the rotating shaft 25 to rotate, and the rotating frame 24 and the plastic bottle rotate accordingly. In summary, before the plastic bottle enters the detection area of ​​the industrial vision inspection equipment 12, it will first rotate from a vertical state to a horizontal state, and then maintain a horizontal posture to enter the detection area of ​​the industrial vision inspection equipment 12, and slowly rotate during the inspection process. At the same time, the industrial vision The CDD camera in the inspection device 12 takes pictures of the plastic bottle multiple times to obtain inspection samples of the plastic bottle at different angles, thereby performing a full-scale inspection of the plastic bottle. Compared with traditional inspection methods, this dynamic inspection method only requires one CDD camera to achieve full-scale inspection of the plastic bottle, without the need to set up multiple CDD cameras. This not only avoids the high cost and complex calibration problems caused by the multi-camera layout, but also expands the inspection coverage of a single camera through dynamic rotation. Ultimately, it achieves full-scale defect recognition with a simplified hardware structure, significantly improving inspection efficiency and reducing equipment investment and maintenance costs. See also Figure 9 As shown, the trigger part includes a clamping seat 31, which is fixed on the rotating frame 24 so that the clamping seat 31 can rotate with the rotating frame 24. A cavity 32 is provided inside the clamping seat 31, and a sliding plug 33 is sealed and slidably connected in the cavity 32. A push rod 34 is fixed on the sliding plug 33, and the sliding plug 33 is connected to the cavity 32 through a spring 35. A groove 315 is provided on the side of the clamping seat 31, and an air supply pipe 316 is arranged in the groove 315. One end of the air supply pipe 316 is connected to the cavity 32. An opening 314 is provided on the top of the clamping seat 31, and the opening 314 is connected to the cavity 32. The other end of the air supply pipe 316 is connected to the cavity 32. One outer end is connected to an air source. As a prior art, the air source is not shown in the figure and will not be described in detail here. Specifically, the air source supplies air to the cavity 32 through the air supply pipe 316. After the gas enters the cavity 32, it can push the slide plug 33 to move, so that the slide plug 33 is close to the opening 314. In this process, the slide plug 33 squeezes the spring 35 and drives the push rod 34 to move. The trigger part also includes an elastic bag 41 and a movable block 42. The movable block 42 is placed above the clamping seat 31 and is arranged opposite to the opening 314. One end of the elastic bag 41 is connected to the clamping seat 31, and the other end is connected to the movable block 42. See also Figure 6As shown, the clamping portion 551 includes two clamping members, both of which are arranged on the outer circumference of the clamping seat 31, and the two clamping members are arranged opposite each other, each clamping member includes two side plates 51, both of which are fixed on the outer circumference of the clamping seat 31, and the two side plates 51 are arranged opposite each other, a slidable magnetic slide 52 is provided between the two side plates 51, and the magnetic slide 52 is connected to the clamping seat 31 by a tension spring 56, and a limited opening 53 is provided on the two side plates 51, and two limit blocks 54 are fixed on the magnetic slide 52, and the two limit blocks 54 slide in the two limit openings 53 respectively, and the magnetic slide 52 moves During the process, the two limiting openings 53 and the two limiting blocks 54 provide limits for the movement of the magnetic slide 52, ensuring the stability of the magnetic slide 52 during the movement, and preventing the magnetic slide 52 from detaching from between the two side plates 51. A clamping strip is adsorbed on the magnetic slide 52. The clamping strip is made of magnetic material so that the clamping strip can be adsorbed on the magnetic slide 52. The clamping strip is composed of a clamping part 551 and a driving part 552. The driving part 552 is fixed to the top of the clamping part 551, and an inclined surface is provided on the driving part 552. The clamping part 551 is used to press against the bottle mouth of the plastic bottle. The side of the clamping part 551 is adhered with an anti-slip pad 553. When the gas enters the cavity 32 and pushes the slide 33 to move, the push rod 34 on the slide 33 moves accordingly. In this process, the push rod 34 can pass through the opening 314 and push up the movable block 42, so that the movable block 42 moves upward. Figure 4 As shown, when the movable block 42 moves upward, the movable block 42 can squeeze the inclined surfaces of the two driving parts 552. Under the action of the two inclined surfaces, the two driving parts 552 will move synchronously and move away from each other when squeezed, which makes the two clamping parts 551 move synchronously and move away from each other. When the two clamping parts 551 move away from each other, the two clamping parts 551 can jointly support the bottle mouth position of the plastic bottle to fix the plastic bottle, forming a Figure 10 In this state, the two clamping parts 551 enable the clamping seat 31 to drive the plastic bottle to move, flip and rotate; See also Figure 9As shown, the device for detecting defects in plastic products based on machine vision proposed by the present invention also has the function of rejecting defective products. Specifically, a first exhaust hole 312 is provided on the bottom surface of the clamping seat 31, and a rotatable blocking plate 3121 is provided on the bottom surface of the clamping seat 31. The blocking plate 3121 is rotatably connected to the clamping seat 31 through a hinge, and the blocking plate 3121 is arranged opposite to the first exhaust hole 312. A torsion spring is provided on the hinge. Under the action of the torsion spring, the blocking plate 3121 has a tendency to block the first exhaust hole 312. The outer peripheral surface of the clamping seat 31 is provided with a first exhaust hole 312. The second exhaust hole 313 is provided with a movable blocking ring 3131 on the outer circumference of the clamping seat 31. A limiting protrusion 3132 is also fixed to the outer circumference of the clamping seat 31. The limiting protrusion 3132 provides a limit for the blocking ring 3131. When the blocking ring 3131 falls on the limiting protrusion 3132, the blocking ring 3131 is arranged opposite the second exhaust hole 313. When the gas is discharged through the first exhaust hole 312, the device performs an operation of rejecting unqualified plastic bottles. When the gas is discharged through the second exhaust hole 313, the device performs an operation of collecting qualified plastic bottles. See also Figure 8 As shown, two limiting lips 311 are fixed to the outer circumference of the clamping seat 31, and the two limiting lips 311 jointly provide constraints for the plastic bottle. When the bottle mouth of the plastic bottle abuts the two limiting lips 311, it indicates that the plastic bottle has been assembled in place. The two pulling parts are respectively arranged on the two limiting lips 311. The pulling part includes a second servo motor 61, and the second servo motor 61 is mounted on the limiting lips 311. The output shaft of the second servo motor 61 is fixed with an eccentric wheel 62, and a fixing rod 63 is fixed on the side of the eccentric wheel 62, and the fixing rod 63 is located at the edge of the eccentric wheel 62. A rotating ring 64 is rotatably provided on the fixing rod 63, and a pull rope 65 is connected to the rotating ring 64. As for the two pull ropes 65, one of the pull ropes 65 is connected to the blocking plate 3121, and the other pull rope 65 is connected to the blocking ring 3131. During the industrial visual inspection process, when the plastic bottle is unqualified, the second servo motor 61 for driving the blocking plate 3121 is operated and drives the corresponding eccentric wheel 62 to rotate, such as Figure 4 、 Figure 5 and Figure 7As shown, in the initial state, the fixed rod 63 is in a lower position. When the eccentric wheel 62 rotates, the fixed rod 63 moves accordingly, and drives the rotating ring 64 to move, so that the rotating ring 64 can pull the blocking plate 3121 through the pull rope 65, thereby rotating the blocking plate 3121. When the blocking plate 3121 rotates, the blocking plate 3121 no longer blocks the first exhaust hole 312. At this time, the high-pressure gas in the cavity 32 can be discharged through the first exhaust hole 312 to perform a deflation action. During the deflation process, the sliding plug 33 is reset under the action of the spring 35, and drives the ejector rod 34 to reset. When the ejector rod 34 is reset, no thrust is applied to the movable block 42. , so that the movable block 42 is reset under the action of the elastic bag 41. Similarly, when the movable block 42 is reset, it no longer applies an extrusion action to the two driving parts 552, so that the two clamping parts 551 are reset respectively under the action of the two tension springs 56. In this process, the two clamping parts 551 no longer provide a clamping effect on the plastic bottle. When the two clamping parts 551 are reset, the jet action of the first exhaust hole 312 can blow the plastic bottle and blow the plastic bottle off the clamping seat 31, thereby realizing automatic rejection of unqualified plastic bottles. It should be noted that the rejection of unqualified plastic bottles is carried out when the plastic bottles are kept in a horizontal state. When the plastic bottle is qualified, the blocking plate 3121 will not move, that is, the two clamping parts 551 still maintain the clamping effect on the plastic bottle. When the plastic bottle is rotated from the horizontal state to the vertical state, the pulling part used to drive the blocking ring 3131 is operated, and the corresponding second servo motor 61 is operated. Similarly, when the second servo motor 61 is running, it can apply tension to the blocking ring 3131 through the pull rope 65, so that the blocking ring 3131 moves. When the blocking ring 3131 moves, it no longer blocks the second exhaust hole 313, and the gas in the cavity 32 can also slowly escape through the second exhaust hole 313, so that the slide plug 33, the ejector rod 34, the movable block 42 and the two clamping parts 551 are reset. When the two clamping parts 551 are reset to their original position, the two clamping parts 551 no longer fix the plastic bottle. At this time, the plastic bottle can fall naturally under the action of gravity, thereby realizing the collection of qualified products. It should be noted that the loading process of the plastic bottle onto the clamping seat 31 can be performed manually or automatically by a machine. This part is the existing technology and is not shown in the figure, so it will not be described in detail here.

[0024] Working principle: When the device for inspecting defects in plastic products based on machine vision is working, the surrounding conveying device 13 on the frame 11 conveys the plastic bottles so that they pass one by one directly under the industrial vision inspection device 12. A number of clamping assemblies consisting of a flipping structure and a clamping structure are arranged on the conveying device to clamp the plastic bottles. In the initial state, the plastic bottles are clamped and kept in a vertical state. Before passing through the inspection area, the first servo motor 22 of the flipping structure drives the swing frame 23 to rotate 90 degrees, so that the plastic bottles are rotated to a horizontal state. During the process of entering the inspection area, the gear 26 engages with the rack 112 to drive the rotating frame 24 and the plastic bottles to rotate slowly. At the same time, the CDD in the industrial vision inspection equipment 12 The camera takes pictures multiple times to obtain test samples at different angles, thus realizing all-round detection. In the triggering part of the clamping structure, the air source supplies air to the cavity 32 of the clamping seat 31 through the air supply pipe 316, pushing the sliding plug 33 to move and driving the ejector rod 34 to lift the movable block 42. The movable block 42 squeezes the inclined surfaces of the two driving parts 552, so that the two clamping parts 551 move synchronously away from each other to support the position of the bottle mouth of the plastic bottle to achieve fixation. For the rejection of defective products, when the plastic bottle is unqualified, the second servo motor 61 for driving the blocking plate 3121 drives the eccentric wheel 62 to rotate, and the blocking plate 3121 is pulled by the pull rope 65 to no longer block the first exhaust hole 312. The high-pressure gas in the cavity 32 is discharged, the sliding plug 33 is reset, driving the ejector rod 34 to reset, and the movable block 42 is in the elastic bag 4. 1 is reset under the action of the two tension springs 56, and the two clamping parts 551 are reset respectively under the action of the two tension springs 56 and no longer clamp the plastic bottle, and the first exhaust hole 312 blows the plastic bottle with air to blow it off the clamping seat 31; for the collection of qualified products, when the plastic bottle is qualified, the blocking plate 3121 does not move, and after the plastic bottle is rotated from the horizontal state to the vertical state, it is used to drive the pulling part of the blocking ring 3131 to operate, and the second servo motor 61 pulls the blocking ring 3131 through the pull rope 65 to no longer block the second exhaust hole 313, and the gas in the cavity 32 slowly leaks out through the second exhaust hole 313, and the sliding plug 33, the ejector rod 34, the movable block 42 and the two clamping parts 551 are reset, and the two clamping parts 551 no longer fix the plastic bottle, and the plastic bottle falls naturally under the action of gravity.

[0025] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0026] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A plastic product defect detection device based on machine vision, characterized by: It comprises a frame (11), an industrial visual inspection device (12) is installed on the frame (11), a surrounding conveying device (13) is installed on the frame (11), a vertical rod (111) is fixed on the frame (11), and a rack (112) is fixed at the top end of the vertical rod (111); The wrap-around conveying device (13) is provided with a plurality of clamping assemblies for clamping plastic bottles, each of the clamping assemblies is composed of a flip structure and a clamping structure, each of the clamping structures is composed of a trigger portion and a clamping portion (551), and the clamping portion (551) includes two clamping members, and the two clamping members are arranged on the outer peripheral surface of the clamping seat (31); The triggering part comprises a clamping seat (31), a cavity (32) is provided inside the clamping seat (31), a sliding plug (33) is sealed and slidably connected in the cavity (32), a push rod (34) is fixed on the sliding plug (33), and the sliding plug (33) and the cavity (32) are connected via a spring (35), a slot (315) is provided on the side of the clamping seat (31), an air supply pipe (316) is arranged in the slot (315), one end of the air supply pipe (316) is connected to the cavity (32), and an opening (314) is provided at the top end of the clamping seat (31), and the opening (314) is connected to the cavity (32).

2. The device for detecting defects in plastic products based on machine vision according to claim 1, characterized in that: The flip structure includes a mounting frame (21), the mounting frame (21) is fixed on the ring conveyor belt of the surrounding conveying equipment (13), a first servo motor (22) is installed on the mounting frame (21), a swing frame (23) is fixed on the output shaft of the first servo motor (22), a hole is opened on the swing frame (23), a rotating shaft (25) is rotatably installed in the hole, a rotating frame (24) is fixed at one end of the rotating shaft (25), and a gear (26) is fixed at the other end, the swing frame (23) and the rotating frame (24) are both U-shaped structures, and the clamping seat (31) is fixed on the rotating frame (24).

3. The device for detecting defects in plastic products based on machine vision according to claim 2, characterized in that: The trigger portion further comprises an elastic capsule (41) and a movable block (42). The movable block (42) is placed above the clamping seat (31), and the movable block (42) is arranged opposite to the opening (314). One end of the elastic capsule (41) is connected to the clamping seat (31), and the other end is connected to the movable block (42).

4. The device for detecting defects in plastic products based on machine vision according to claim 3, characterized in that: Each of the clamping members comprises two side plates (51), the two side plates (51) are fixed on the outer peripheral surface of the clamping seat (31), and the two side plates (51) are arranged opposite to each other. A slidable magnetic slide plate (52) is arranged between the two side plates (51), and the magnetic slide plate (52) is connected to the clamping seat (31) via a tension spring (56). A limiting opening (53) is provided on the two side plates (51), and two limiting blocks (54) are fixed on the magnetic slide plate (52). The two limiting blocks (54) slide in the two limiting openings (53) respectively. A clamping strip is adsorbed on the magnetic slide plate (52), and the clamping strip consists of a clamping portion (551) and a driving portion (552). The driving portion (552) is fixed on the top end of the clamping portion (551), and an inclined surface is provided on the driving portion (552). The clamping portion (551) is used to resist the bottle mouth of the plastic bottle.

5. The device for detecting defects in plastic products based on machine vision according to claim 1, characterized in that: The bottom surface of the clamping seat (31) is provided with a first exhaust hole (312), the bottom surface of the clamping seat (31) is provided with a rotatable blocking plate (3121), and the blocking plate (3121) is rotatably connected to the clamping seat (31) through a hinge, the blocking plate (3121) is arranged opposite to the first exhaust hole (312), the hinge is provided with a torsion spring, the outer peripheral surface of the clamping seat (31) is provided with a second exhaust hole (313), the outer peripheral surface of the clamping seat (31) is provided with a movable blocking ring (3131), the outer peripheral surface of the clamping seat (31) is also fixed with a limiting protrusion (3132), the limiting protrusion (3132) provides a limit for the blocking ring (3131), and when the blocking ring (3131) falls on the limiting protrusion (3132), the blocking ring (3131) is arranged opposite to the second exhaust hole (313); Two limiting lips (311) are fixed to the outer peripheral surface of the clamping seat (31), and the two limiting lips (311) together provide constraints for the plastic bottle. A pulling portion is provided on both the limiting lips (311).

6. The device for detecting defects in plastic products based on machine vision according to claim 5, characterized in that: When the gas is discharged through the first exhaust hole (312), the device performs an action of rejecting unqualified plastic bottles, and when the gas is discharged through the second exhaust hole (313), the device performs an action of collecting qualified plastic bottles.

7. The device for detecting defects in plastic products based on machine vision according to claim 6, characterized in that: The pulling part includes a second servo motor (61), which is installed on the limiting lip (311). The output shaft of the second servo motor (61) is fixed with an eccentric wheel (62). A fixing rod (63) is fixed on the side of the eccentric wheel (62), and the fixing rod (63) is located at the edge of the eccentric wheel (62). A rotating ring (64) is rotatably provided on the fixing rod (63), and a pull rope (65) is connected to the rotating ring (64). For the two pull ropes (65), one of the pull ropes (65) is connected to the blocking plate (3121), and the other pull rope (65) is connected to the blocking ring (3131).

8. The device for detecting defects in plastic products based on machine vision according to claim 5, characterized in that: An anti-slip pad (553) is bonded to the side surface of the clamping portion (551).

9. The device for detecting defects in plastic products based on machine vision according to claim 1, characterized in that: The push rod (34) is arranged opposite to the opening (314).

10. The device for detecting defects in plastic products based on machine vision according to claim 4, characterized in that: The magnetic slide plate (52) and the clamping bar are both made of magnetic material.

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