Linear bottle cap defect detection device and detection method thereof

Abstract

The invention provides a linear bottle cap defect detection device, which is characterized by comprising a conveying belt; the in-cover detection unit comprises a first camera, an imaging unit, a first light source and a first photoelectric sensor which are erected right above the conveying belt, the imaging unit comprises a polygon prism and a plurality of plane mirrors which are distributed around the polygon prism and correspond to mirror surfaces of the polygon prism respectively, and the first camera is located right above the polygon prism and shoots downwards; the first light source is an annular light source and located under the polygon prism. The polygon prism and the plane mirror are both mounted on the upper side of the same mounting plate, the mounting plate is provided with a window for downward imaging of the plane mirror, the polygon prism is conical and has an upward tip, and the first camera acquires a bottle cap image through reflection of the polygon prism and the plane mirror; the first photoelectric sensors are installed on the two sides of the conveying belt and horizontally correspond to the position under the polygon prism. And the control unit is electrically connected with the first camera, the first light source and the first photoelectric sensor. The device is suitable for detecting the special-shaped bottle cap.

Description

[0001] The present invention relates to the technical field of bottle cap detection equipment, and in particular to a linear bottle cap defect detection device and a detection method thereof. Background Art

[0002] Bottle caps are used to seal the mouths of bottle containers. The quality of bottle caps is also a factor in judging whether the container can be used normally. Therefore, bottle cap inspection is a routine inspection item for bottle containers.

[0003] The bottle cap detection device currently used is for testing ordinary bottle caps with a direct concave bottom surface. However, in order to improve the sealing performance of bottle caps, some companies, especially those used to store volatile products, have a columnar body protruding downward from the center of the concave bottom surface of the bottle cap, such as Figure 1 As shown, when the bottle cap is placed on the bottle, the columnar body inserts into the bottle mouth to block the bottle mouth, improving the sealing performance of the bottle cap. For this type of bottle cap, due to the obstruction of the outer wall of the bottle cap, existing inspection devices cannot accurately obtain the side view of the columnar body, thus failing to achieve a comprehensive inspection of the bottle cap, resulting in inaccurate test results. Furthermore, existing bottle cap inspection devices have an unreasonable layout of inspection stations, occupying a large space and low transmission efficiency. Summary of the Invention

[0004] In order to solve the technical problems existing in the above background technology, the present invention provides a linear bottle cap defect detection device and a detection method thereof.

[0005] The technical solutions of the present invention are as follows: A linear bottle cap defect detection device comprises a conveyor belt, a feeding unit, a cap bottom detection unit, an outer wall detection unit, a cap top detection unit and a cap inner detection unit; The conveyor belt comprises a first conveyor belt and a second conveyor belt arranged sequentially in the same direction, with a distance between the two; The feeding unit is provided at one end of the first conveyor belt input, and includes a star wheel spacing component and an air conveying component for conveying bottle caps to the star wheel spacing component. The star wheel spacing component can move the bottle caps to the first conveyor belt at equal intervals; The cover bottom detection unit is located downstream of the feeding unit and includes a first image acquisition unit mounted above the first conveyor belt; The outer wall detection unit is located downstream of the cover bottom detection unit and includes two pairs of second image acquisition units symmetrically arranged on both sides of the top of the first conveyor belt; The cover top detection unit is located between the first conveyor belt and the second conveyor belt, and includes a pinch belt group and a third image acquisition unit located below the pinch belt group. The two ends of the pinch belt group are respectively connected to the first conveyor belt and the second conveyor belt; The inner cover detection unit includes a fourth image acquisition unit mounted above the second conveyor belt.

[0006] Furthermore, the star wheel spacing assembly includes a support platform located on one side of the first conveyor belt. The support platform is provided with a star wheel and a guide plate. The guide plate is located radially outside the star wheel, and a spacing channel is formed between the guide plate and the star wheel. The spacing channel extends to above the first conveyor belt. A feed channel is provided on the guide plate. One end of the feed channel is connected to the spacing channel, and the other end extends radially along the star wheel and docks with the air conveying assembly.

[0007] Furthermore, a pad is provided on the lower side of the guide plate, which extends to below the feed channel and the spacing channel. A transition plate is docked on the side of the pad close to the first conveyor belt. The top surface of the transition plate is flush with the top surface of the pad, and the transition plate extends to below the spacing channel and above the first conveyor belt.

[0008] Furthermore, the air delivery component includes a bellows, the top of which is provided with a plurality of air outlets spaced apart along the conveying direction, and the air is discharged obliquely in the conveying direction. A protective cover is provided on the top of the bellows, and the protective cover cooperates with the top surface of the bellows to form a conveying channel.

[0009] Furthermore, a U-shaped groove plate is provided directly below the air outlet, and the U-shaped groove plate is connected to the edge of the air outlet to form an air duct inclined upward along the conveying direction. The widths of the air outlet and the air duct gradually decrease along the conveying direction.

[0010] Furthermore, the air outlet is trapezoidal.

[0011] Furthermore, the U-shaped trough plate includes a trough bottom plate and two trough side plates. The trough bottom plate is trapezoidal, and the upper base of its trapezoidal shape is connected to the upper base of the trapezoidal shape of the air outlet. The two trough side plates extend upward from the two waist edges of the trapezoidal shape of the trough bottom plate and connect the two waist edges on the corresponding sides of the trapezoidal shape of the air outlet.

[0012] Furthermore, the fourth image acquisition unit includes an imaging lens group, which includes a polygonal prism and a plurality of plane mirrors distributed around the polygonal prism and corresponding to each mirror surface of the polygonal prism. The polygonal prism can obtain the image of the bottle cap below the polygonal prism through the plane mirrors and perform imaging upwards. The inner cap detection unit also includes a light shield, and the imaging lens group is located inside the light shield.

[0013] Furthermore, the cap bottom detection unit, the outer wall detection unit, the cap top detection unit and the cap inner detection unit are all provided with photoelectric sensors, which are configured to trigger a signal when the bottle cap moves to the detection position of the unit where it is located; It also includes a control unit, which is electrically connected to each image acquisition unit and each photoelectric sensor.

[0014] The present application also provides a linear bottle cap defect detection method, which is applied to a linear bottle cap defect detection device according to claim 9, and is characterized by comprising: S1, the air delivery component sends the bottle caps into the star wheel spacing component; S2, the star wheel spacing assembly separates the bottle caps and moves them to the first conveyor belt; S3: The bottle cap is moved to the detection position of the cap bottom detection unit, and the corresponding photoelectric sensor triggers a signal. The control unit starts the first image acquisition unit according to the signal to obtain an image of the bottle cap bottom; S4: The bottle cap is moved to the detection position of the outer wall detection unit, and the corresponding photoelectric sensor triggers a signal. The control unit starts the second image acquisition unit according to the signal to obtain the image of the outer side of the bottle cap; S5, the bottle cap is moved from the first conveyor belt to the pinch conveyor belt group, which moves the bottle cap to the detection position of the cap top detection unit. The corresponding photoelectric sensor triggers a signal, and the control unit starts the third image acquisition unit according to the signal to obtain an image of the top surface of the bottle cap; S6. The bottle cap is moved from the clamping belt group to the second conveyor belt, and the second conveyor belt moves the bottle cap to the detection position of the inner cap detection unit. The corresponding photoelectric sensor triggers a signal, and the control unit starts the fourth image acquisition unit according to the signal to obtain an image of the inner side of the bottle cap or the side of the internal column.

[0015] The linear bottle cap defect detection device and detection method provided by the present invention have the following effects: 1. The first image acquisition unit is located above the first conveyor belt, the second image acquisition unit is located on both sides of the first conveyor belt, and the pinch belt group is docked above the first conveyor belt. In this way, the first image acquisition unit and the pinch belt group can be closer to the second image acquisition unit without affecting the operation of the second image acquisition unit, thereby making the structure of the detection device more compact, occupying less ground, and having a more reasonable layout.

[0016] 2. The air delivery component can ensure the smooth input of bottle caps and guarantee the detection efficiency of the detection device.

[0017] 3. It is suitable for the inspection of special-shaped bottle caps as well as ordinary bottle caps. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In the attached figure: Figure 1 This is a schematic diagram of the bottle cap to be inspected; Figure 2 is a schematic diagram of the detection device; Figure 3 is a schematic diagram of the detection unit inside the cover; Figure 4 is a schematic diagram of an imaging unit; Figure 5 Schematic diagram of the feeding unit; Figure 6 Schematic diagram of the air delivery plate; Figure 7 Schematic diagram of a cover bottom detection unit; Figure 8 is a schematic diagram of an outer wall detection unit; Figure 9 Schematic diagram of the roof detection unit.

[0019] The components represented by the reference numerals in the figure are: 1. Conveyor belt; 11. First conveyor belt; 12. Second conveyor belt; 2. Feeding unit; 21. Star wheel spacing assembly; 211. Support platform; 212. Star wheel; 213. Guide plate; 214. Spacing channel; 215. Feeding channel; 216. Pad; 217. Transition plate; 218. Pressing plate; 22. Air delivery assembly; 221. Bellows; 222. Air outlet; 223. Protective cover; 224. Conveying channel; 225. Air delivery plate; 226. Slot bottom plate; 227. Slot side plate; 23. Wind control photoelectric sensor; 3. Cover bottom detection unit; 31. First image acquisition unit; 311. First light source; 312. First camera; 32. First photoelectric sensor; 4. Outer wall detection unit; 4 1. Second image acquisition unit; 411. Second light source; 412. Second camera; 42. Second photoelectric sensor; 5. Top cover detection unit; 51. Feeding belt group; 511. Suspension; 512. Crossbeam; 513. Sliding seat; 514. Cover belt component; 515. Adjustment component; 52. Third image acquisition unit; 521. Third light source; 522. Third camera; 53. Third photoelectric sensor; 6. In-cover detection unit; 61. Fourth image acquisition unit; 611. Fourth camera; 612. Imaging unit; 6121. Polygonal prism; 6122. Plane mirror; 613. Fourth light source; 62. Mounting plate; 63. Light shield; 64. Fourth photoelectric sensor; 7. Rejection unit. DETAILED DESCRIPTION Example

[0020] like Figure 2 As shown, the embodiment of the present invention provides a linear bottle cap defect detection device (hereinafter referred to as the detection device), which is not only reasonably arranged, but also can be used for detecting defects such as Figure 1 It can fully inspect special-shaped bottle caps of the shape shown in the figure, and can also be used to inspect ordinary bottle caps.

[0021] A linear bottle cap defect detection device comprises a conveyor belt 1, a feeding unit 2, a cap bottom detection unit 3, an outer wall detection unit 4, a cap top detection unit 5 and a cap inner detection unit 6.

[0022] The conveyor belt 1 is used for conveying bottle caps, and comprises a first conveyor belt 11 and a second conveyor belt 12 which are sequentially arranged in the same direction and spaced apart from each other.

[0023] The feeding unit 2 is arranged at one end of the input of the first conveyor belt 11. The feeding unit 2 includes a star wheel spacing component 21 and an air conveying component 22 for conveying bottle caps to the star wheel spacing component 21. The star wheel spacing component 21 can move the bottle caps to the first conveyor belt 11 at equal intervals.

[0024] The cover bottom detection unit 3 is located downstream of the feeding unit 2 , and includes a first image acquisition unit 31 mounted above the first conveyor belt 11 .

[0025] The outer wall detection unit 4 is located downstream of the cover bottom detection unit 3 , and includes two pairs of second image acquisition units 41 symmetrically arranged on both sides of the top of the first conveyor belt 11 .

[0026] The top cover detection unit 5 is located between the first conveyor belt 11 and the second conveyor belt 12, and includes a pinching belt group 51 and a third image acquisition unit 52 located below the pinching belt group 51. The two ends of the pinching belt group 51 are respectively connected to the first conveyor belt 11 and the second conveyor belt 12.

[0027] The inner cover detection unit 6 includes a fourth image acquisition unit 61 mounted above the second conveyor belt 12 .

[0028] In addition, the linear bottle cap defect detection device also includes a control unit and an image processing unit. The control unit is used to control the operation of the device. The image processing unit is electrically connected to the control unit and is used to process the images obtained by each image acquisition unit and determine whether there are defects in the bottle cap and transmit signals to the control unit.

[0029] In addition, a rejection unit 7 is provided on the second conveyor belt 12 and downstream of the inner-cap detection unit 6 , which is electrically connected to the control unit and is used to reject defective bottle caps.

[0030] In the detection device provided in this embodiment, the first image acquisition unit 31 is located above the first conveyor belt 11, the second image acquisition unit 41 is located on both sides of the first conveyor belt 11, and the pinching belt group 51 is docked above the first conveyor belt 11. In this way, the first image acquisition unit 31 and the pinching belt group 51 can be closer to the second image acquisition unit 41 without affecting the operation of the second image acquisition unit 41, thereby making the structure of the detection device more compact, occupying a smaller ground surface, and having a more reasonable layout.

[0031] It should be noted that when the detection device is detecting, the bottle caps are conveyed upside down, that is, the bottom of the bottle faces upwards.

[0032] The following is a detailed description with reference to specific views.

[0033] Please combine Figure 3 and Figure 4 As shown, the star wheel spacing assembly 21 is used to space the bottle caps transported by the air conveying assembly 22 at equal distances and move them onto the conveyor belt 1.

[0034] The star wheel spacing assembly 21 specifically includes a support platform 211, located on one side of the first conveyor belt 11. A star wheel 212 is rotatably connected to the support platform 211. The star wheel 212 rotates horizontally, with a portion of its edge positioned above the first conveyor belt 11. An L-shaped guide plate 213 is also provided on the support platform 211. The guide plate 213 is parallel to the star wheel 212 and radially outward of the star wheel 212.

[0035] A portion of the guide plate 213 is positioned above the first conveyor belt 11 and extends in the direction of conveyance of the first conveyor belt 11. The other portion extends from above the first conveyor belt 11 toward the support platform 211 and is mounted on the top surface of the support platform 211. The inner corner of the guide plate 213 is curved and concentric with the star wheel 212. The guide plate 213 cooperates with the edge of the star wheel 212 to form a spacing channel 214, which extends above the first conveyor belt 11.

[0036] The guide plate 213 is provided with a feed channel 215, which is located above the support platform 211 and extends through the inner and outer sides of the guide plate 213, dividing the guide plate 213 into two horizontal sections. One end of the feed channel 215 is connected to the spacing channel 214, and the other end extends radially along the star wheel 212 and connects to the air conveying assembly 22.

[0037] A pad 216 is provided on the lower side of the guide plate 213 , and the pad 216 extends to below the feeding channel 215 and the spacing channel 214 .

[0038] A transition plate 217 is horizontally connected to the side of the pad 216 close to the conveyor belt 1. The top surface of the transition plate 217 is flush with the top surface of the pad 216. The transition plate 217 extends to the bottom of the spacing channel 214 and above the first conveyor belt 11, and the transition plate 217 is close to the top surface of the first conveyor belt 11.

[0039] When in use, the bottle cap first moves on the pad 216, is clamped by the star wheel 212 and moves into the separating channel 214 from the feeding channel 215, and in the separating channel 214, the bottle cap moves from the pad 216 to the transition plate 217, and then moves from the transition plate 217 to the top surface of the conveyor belt 1.

[0040] A pressing plate 218 is provided above the guide plate 213 . The pressing plate 218 extends to above the feeding channel 215 and the spacing channel 214 , and the distance between the pressing plate 218 and the guide plate 213 is adjustable.

[0041] The air delivery component 22 is used to input bottle caps into the feeding channel 215. It includes a bellows 221. The top of the bellows 221 is provided with multiple air outlets 222 arranged at intervals along the conveying direction, and the air is discharged obliquely in the conveying direction. The top of the bellows 221 is provided with a protective cover 223. The protective cover 223 cooperates with the top surface of the bellows 221 to form a conveying channel 224.

[0042] The bellows 221 comprises a U-shaped profile with sealing plates welded or screwed at both ends. A blast plate 225 is mounted on the top opening of the profile, and an air inlet duct connected to the blower is located on the bottom wall of the profile. The bottle caps move on the blast plate 225, and an air outlet 222 is formed on the blast plate 225.

[0043] A U-shaped groove plate is provided directly below the air outlet 222, and the U-shaped groove plate is connected to the edge of the air outlet 222 to form an air duct inclined upward along the conveying direction. The widths of the air outlet 222 and the air duct gradually decrease along the conveying direction.

[0044] The air outlet 222 is preferably trapezoidal in shape, gradually tapering toward the conveying direction of the air delivery component 22 .

[0045] The U-shaped trough plate includes a trough bottom plate 226 and two trough side plates 227. The trough bottom plate 226 is also trapezoidal in shape and is located directly below the air outlet 222. It extends downwardly and obliquely in the opposite direction of the conveying direction of the air delivery component 22. The upper bottom edge of the trapezoidal shape of the trough bottom plate 226 is connected to the upper bottom edge of the trapezoidal shape of the air outlet 222. The lower bottom edge of the trapezoidal shape of the trough bottom plate 226 is located below the lower bottom edge of the trapezoidal shape of the air outlet 222. The two trough side plates 227 extend upward from the two waist edges of the trapezoidal shape of the trough bottom plate 226 and connect to the two waist edges on the corresponding sides of the trapezoidal shape of the air outlet 222. In this way, the trough plate and the air outlet 222 cooperate to form an air duct, guiding the airflow to be blown out obliquely upward in the conveying direction of the air delivery component 22.

[0046] In this embodiment, the air outlet 222 and the trough bottom plate 226 are trapezoidal in shape that tapers along the conveying direction. First, they can concentrate the wind force in the conveying direction and effectively act on the bottom surface and lower part of the bottle cap to generate sufficient thrust, thereby avoiding wind force dispersion, resulting in insufficient wind force, and poor bottle cap conveying effect; second, they can increase the flow rate of the air flow out of the air outlet 222 and increase the wind force, which not only increases the thrust on the bottle cap, but also improves the utilization effect of the air flow supplied by the fan, thereby reducing the working power of the fan.

[0047] The trough bottom plate 226 is preferably tilted downward at an angle of 20°-30° so that the upward wind force can be divided into a larger forward component and a smaller upward component. The larger forward component can provide a greater thrust to the bottle caps, ensuring that the bottle caps are transported forward smoothly, while the smaller upward component opposes the weight of the bottle caps, reducing the friction between the bottle caps and the air delivery plate 225 as they move forward, further ensuring that the bottle caps are transported smoothly and steadily.

[0048] When the two groove side plates 227 extend upward, they gradually move away from each other and extend obliquely toward the two waist edges of the air outlet 222, so that the air flow in the air duct and in the vertical direction flows outward in a gradually divergent manner, avoiding the generation of turbulence or vortex phenomena that cause unstable airflow and affect the smooth transportation of bottle caps.

[0049] In this embodiment, the bellows 221 is installed on the support platform 211, one end edge of the air delivery plate 225 is attached to the edge of the pad 216, the top surface of the air delivery plate 225 is flush with the top surface of the pad 216, and the conveying channel 224 is connected to the feed channel 215.

[0050] When conveying bottle caps, the air conveying component 22 of this embodiment not only provides a large thrust to the bottle caps by means of a large wind force, ensuring that the bottle caps can move smoothly and continuously, but also does not cause the problem of being unable to move due to insufficient friction on the top surface of the conveyor belt 1 or the chain, but also does not require a rotating wheel at the end of the air conveying component 22, and thus has no curved surface, thereby enabling the air conveying plate 225 of the air conveying component 22 to directly dock with the feed channel 215 of the star wheel spacing component 21, which is easy to install and the bottle caps can smoothly transition between the two, ensuring the smooth conveying of the bottle caps.

[0051] Please combine Figure 5 As shown, the first image acquisition unit 31 includes a first light source 311 and a first camera 312. The first light source 311 is a dome light source, and the first camera 312 is located directly above the first light source 311 and acquires images downward.

[0052] The cover bottom detection unit 3 further includes a first photoelectric sensor 32, which is mounted on both sides of the first conveyor belt 11 and is positioned horizontally directly below the first light source 311. The first light source 311, the first camera 312, and the first photoelectric sensor 32 are all electrically connected to the control unit, and the first camera 312 is electrically connected to the image processing unit.

[0053] When the bottle cap is moved to the position directly below the first light source 311 , the first photoelectric sensor 32 triggers a signal, and the control unit controls the first light source 311 and the first camera 312 to start.

[0054] Please combine Figure 6 As shown, two pairs of second image acquisition units 41 are symmetrically arranged on either side of the top of the first conveyor belt 11. The two second image acquisition units 41 in each pair are symmetrically arranged, with the axis of symmetry perpendicular to the conveying direction of the first conveyor belt 11. The four second image acquisition units 41 all shoot horizontally toward the same position on the top of the first conveyor belt 11, and the shooting directions of the two second image acquisition units 41 in each pair are 90-120 degrees.

[0055] The outer wall detection unit 4 further includes a second photoelectric sensor 42, which is installed on both sides of the first conveyor belt 11 and corresponds to the top of the first conveyor belt 11. The second photoelectric sensor 42 is located on the symmetric axis of the two second image acquisition units 41 in each pair.

[0056] The second image acquisition unit 41 includes a second light source 411 and a second camera 412. The second light source 411 is a bar-shaped light source, extending horizontally, and includes two parallel distributions up and down. The second camera 412 is located at the rear side of the second light source 411 and corresponds to the gap between the two second light sources 411.

[0057] The second light source 411 , the second camera 412 and the second photosensor 42 are all electrically connected to the control unit, and the second camera 412 is electrically connected to the image processing unit.

[0058] Please combine Figure 7 As shown, the conveying belt assembly 51 includes a suspension frame 511, on which is mounted a crossbeam 512 perpendicular to the conveying direction of the conveyor belt 1. Two sliding seats 513 are slidably connected to the crossbeam 512. The lower sides of the sliding seats 513 are provided with a cap clamping belt component 514, which is located below the crossbeam 512. The two cap clamping belt components 514 are symmetrically arranged and dock with the tops of the opposite ends of the first conveyor belt 11 and the second conveyor belt 12, clamping the side walls of the bottle caps for conveyance.

[0059] The suspension 511 is further provided with an adjusting component 515 for adjusting the distance between the two sliding seats 513 .

[0060] The third image acquisition unit 52 includes a third light source 521 and a third camera 522. The third light source 521 is an annular light source and is located directly below the pinching belt group 51. The third camera 522 is located directly below the third light source 521 and shoots upward.

[0061] The cover top detection unit 5 further includes a third photoelectric sensor 53 , which is located on both sides of the two cover tape clamping components 514 perpendicular to the conveying direction thereof and horizontally corresponds to a position just above the center of the third light source 521 .

[0062] The third light source 521 , the third camera 522 and the third photosensor 53 are all electrically connected to the control unit, and the third camera 522 is electrically connected to the image processing unit.

[0063] Please combine Figure 8 and Figure 9 As shown, the fourth image acquisition unit 61 has a fourth camera 611, an imaging unit 612 and a fourth light source 613 The imaging unit 612 includes a polygonal prism 6121 and a plurality of plane mirrors 6122 distributed around the polygonal prism 6121 and corresponding to the respective mirror surfaces of the polygonal prism 6121. The fourth camera 611 is located directly above the polygonal prism 6121 and shoots downward. The fourth light source 613 is a ring-shaped light source located directly below the polygonal prism 6121.

[0064] The polygonal prism 6121 is conical, preferably a conical quadrangular prism, with its tip pointing upward. Four plane mirrors 6122 are provided, each mirrored surface facing the respective mirror surfaces of the polygonal prism 6121. The plane mirrors 6122 are tilted downward. When a bottle cap moves below the polygonal prism 6121, the image of the bottle cap is imaged by the plane mirrors 6122 and projected onto the polygonal prism 6121. The image is then projected upward through the polygonal prism 6121 and onto the fourth camera 611.

[0065] The polygonal mirror 6121 and the plane mirror 6122 are both mounted on the upper side of the same mounting plate 62. The polygonal mirror 6121 is fixed to the mounting plate 62, and the plane mirror 6122 is adjustably mounted on the mounting plate 62. The upper and lower positions, the distance from the polygonal mirror 6121 and the cleaning angle can all be adjusted.

[0066] The mounting plate 62 is provided with a window for the plane mirror 6122 to project downward. A light shield 63 is also provided on the mounting plate 62. The imaging unit 612 is located within the light shield 63. A hole is provided at the top of the light shield 63 for inserting the fourth camera 611. The light shield 63 creates a dark space, thereby improving the imaging quality of the imaging unit 612 while preventing interference from ambient light.

[0067] The fourth light source 613 is mounted on the lower side of the mounting plate 62 .

[0068] The cap inner detection unit 6 further includes a fourth photoelectric sensor 64 , which is installed on both sides of the second conveyor belt 12 and horizontally corresponds to the position directly below the polygonal mirror 6121 . When the bottle cap moves directly below the polygonal mirror 6121 , the fourth photoelectric sensor 64 is triggered to generate a signal.

[0069] The fourth camera 611 , the fourth light source 613 , and the fourth photosensor 64 are electrically connected to the control unit, and the fourth camera 611 is electrically connected to the image processing unit. Example

[0070] This embodiment provides a linear bottle cap defect detection method, which is applied to the detection device of the first embodiment, including: S1, the air delivery component 22 delivers the bottle caps into the star wheel spacing component 21.

[0071] S2, the star wheel spacing assembly 21 separates the bottle caps and moves them to the first conveyor belt 11.

[0072] S3, the bottle cap is moved to the detection position of the cap bottom detection unit 3, the corresponding photoelectric sensor triggers a signal, and the control unit starts the first image acquisition unit 31 according to the signal to obtain the image of the bottle cap bottom.

[0073] When the bottle cap is moved to the detection position of the cap bottom detection unit 3, the first photoelectric sensor 32 triggers a signal to the control unit, and the control unit controls the first camera 312 and the first light source 311 to start and capture the image of the bottle cap bottom.

[0074] S4, the bottle cap is moved to the detection position of the outer wall detection unit 4, the corresponding photoelectric sensor triggers a signal, and the control unit starts the second image acquisition unit 41 according to the signal to obtain the image of the outer side of the bottle cap.

[0075] When the bottle cap is moved to the detection position of the outer wall detection unit 4, the second photoelectric sensor 42 triggers a signal to the control unit, and the control unit controls all the second cameras 412 and all the second light sources 411 to start simultaneously to capture the image of the outer wall of the bottle cap.

[0076] S5. The bottle cap is moved from the first conveyor belt 11 to the pinching belt group 51. The pinching belt group 51 moves the bottle cap to the detection position of the cap top detection unit 5. The corresponding photoelectric sensor triggers a signal. The control unit starts the third image acquisition unit 52 according to the signal to obtain an image of the top surface of the bottle cap.

[0077] When the bottle cap is moved to the detection position of the cap top detection unit 5, the third photoelectric sensor 53 triggers a signal to the control unit, and the control unit controls the third camera 522 and the third light source 521 to start and capture the image of the bottle cap top.

[0078] S6. The bottle cap is moved from the pinching belt group 51 to the second conveyor belt 12. The second conveyor belt 12 moves the bottle cap to the detection position of the inner cap detection unit 6. The corresponding photoelectric sensor triggers a signal. The control unit starts the fourth image acquisition unit 61 according to the signal to obtain an image of the inner side surface of the bottle cap or the side surface of the internal column.

[0079] When the bottle cap is moved to the detection position of the inner cap detection unit 6, the fourth photoelectric sensor 64 triggers a signal to the control unit, and the control unit controls the fourth camera 611 and the fourth light source 613 to start and take images of the inner side of the bottle cap or the side of the internal column.

[0080] S7. The image processing unit collects the images taken by the first, second, third and fourth cameras 611 and processes the images. If it is determined that the bottle cap has defects, a signal is sent to the control unit, and the control unit controls the rejection unit 7 to reject the corresponding bottle cap. Example

[0081] This embodiment provides a linear bottle cap defect detection method, which is basically the same as the second embodiment, except that the air delivery assembly 22 includes at least two air delivery assemblies 22 connected in sequence. A photoelectric window is provided on the side wall of the protective cover 223 of the air delivery assembly 22 connected to the support platform 211, and a wind control photoelectric sensor 23 (such as Figure 2 As shown, the wind control photoelectric sensor 23 is electrically connected to the control unit. The photoelectric window is a preset distance from the output end of the air delivery assembly 22. When the bottle cap passes the position corresponding to the photoelectric window, the wind control photoelectric sensor 23 triggers a signal.

[0082] The air delivery assembly 22 includes the following steps when conveying bottle caps: Step 1: Obtain the trigger signal of the wind control photoelectric sensor 23 and determine whether the signal is continuously triggered within a unit time. If so, proceed to step 2; otherwise, remain unchanged. Step 2: Reduce the fan operating power of the other air delivery components 22 except the air delivery component 22 connected to the support platform 211, and execute step 3; Step 3: Obtain a trigger signal from the wind control photoelectric sensor 23. When the signal is interrupted, detect the preset time and restore the fan operating power of the other air delivery components 22 except the air delivery component 22 connected to the support platform 211.

Claims

1. The conveyor belt (1) comprises a first conveyor belt (11) and a second conveyor belt (12) arranged in the same direction and sequentially, with a distance between the first and second conveyor belts; The feeding unit (2) is provided at one end of the input of the first conveyor belt (11), and comprises a star wheel spacing component (21) and an air delivery component (22) for delivering bottle caps to the star wheel spacing component (21). The star wheel spacing component (21) can move the bottle caps at equal intervals onto the first conveyor belt (11); The cover bottom detection unit (3) is located downstream of the feeding unit (2) and includes a first image acquisition unit (31) mounted above the first conveyor belt (11); The outer wall detection unit (4) is located downstream of the cover bottom detection unit (3), and includes two pairs of second image acquisition units (41) symmetrically arranged on both sides of the top of the first conveyor belt (11); The cover top detection unit (5) is located between the first conveyor belt (11) and the second conveyor belt (12), and includes a clamping belt group (51) and a third image acquisition unit (52) located below the clamping belt group (51), and the two ends of the clamping belt group (51) are respectively connected to the first conveyor belt (11) and the second conveyor belt (12); The inner cover detection unit (6) comprises a fourth image acquisition unit (61) mounted above the second conveyor belt (12).

2. A linear bottle cap defect detection device according to claim 1, characterized in that: The star wheel spacing assembly (21) includes a support platform (211) located on one side of the first conveyor belt (11). The support platform (211) is provided with a star wheel (212) and a guide plate (213). The guide plate (213) is located radially outside the star wheel (212) and forms a spacing channel (214) between the guide plate (213) and the star wheel (212). The spacing channel (214) extends above the first conveyor belt (11). A feeding channel (215) is provided on the guide plate (213). One end of the feeding channel (215) is connected to the spacing channel (214), and the other end extends radially along the star wheel (212) and docks with the air conveying assembly (22).

3. A linear bottle cap defect detection device according to claim 2, characterized in that: A pad (216) is provided on the lower side of the guide plate (213), and the pad (216) extends to below the feed channel (215) and the separation channel (214). A transition plate (217) is connected to the side of the pad (216) close to the first conveyor belt (11), and the top surface of the transition plate (217) is flush with the top surface of the pad (216). The transition plate (217) extends to below the separation channel (214) and above the first conveyor belt (11).

4. The linear bottle cap defect detection device according to claim 1, characterized in that: The air delivery assembly (22) comprises a bellows (221), a top of the bellows (221) being provided with a plurality of air outlets (222) spaced apart along a conveying direction, and discharging air in an inclined manner in the conveying direction, a top of the bellows (221) being provided with a protective cover (223), and the protective cover (223) cooperates with the top surface of the bellows (221) to form a conveying channel (224).

5. The linear bottle cap defect detection device according to claim 4, characterized in that: A U-shaped groove plate is provided directly below the air outlet (222), and the U-shaped groove plate is connected to the edge of the air outlet (222) to form an air duct that is inclined upward along the conveying direction, and the widths of the air outlet (222) and the air duct are gradually reduced along the conveying direction.

6. The linear bottle cap defect detection device according to claim 5, characterized in that: The air outlet (222) is trapezoidal.

7. The linear bottle cap defect detection device according to claim 6, characterized in that: The U-shaped trough plate comprises a trough bottom plate (226) and two trough side plates (227). The trough bottom plate (226) is trapezoidal, and the upper bottom edge of the trapezoidal shape of the trough bottom plate (226) is connected to the upper bottom edge of the trapezoidal shape of the air outlet (222). The two trough side plates (227) extend upward from the two waist edges of the trapezoidal shape of the trough bottom plate (226) and connect the two waist edges on the corresponding sides of the trapezoidal shape of the air outlet (222).

8. The linear bottle cap defect detection device according to claim 1, characterized in that: The fourth image acquisition unit (61) includes an imaging lens group, which includes a polygonal prism (6121) and a plurality of plane mirrors (6122) distributed around the polygonal prism (6121) and corresponding to each mirror surface of the polygonal prism (6121). The polygonal prism (6121) can obtain the image of the bottle cap below the polygonal prism (6121) through the plane mirrors (6122) and perform imaging upward. The inner-cap detection unit (6) also includes a light shield (63), and the imaging lens group is located inside the light shield (63).

9. A linear bottle cap defect detection device according to any one of claims 1 to 8, characterized in that: The cap bottom detection unit (3), the outer wall detection unit (4), the cap top detection unit (5) and the cap inner detection unit (6) are all provided with photoelectric sensors, and the photoelectric sensors are configured to trigger a signal when the bottle cap moves to the detection position of the unit where it is located; It also includes a control unit, which is electrically connected to each image acquisition unit and each photoelectric sensor.

10. A linear bottle cap defect detection method, applied to the linear bottle cap defect detection device according to claim 9, characterized in that: include: S1, air delivery assembly (22) delivers the bottle caps into the star wheel spacing assembly (21); S2, the star wheel spacing assembly (21) separates the bottle caps and moves them to the first conveyor belt (11); S3, the bottle cap is moved to the detection position of the bottom cap detection unit (3), the corresponding photoelectric sensor triggers a signal, and the control unit starts the first image acquisition unit (31) according to the signal to obtain the image of the bottom of the bottle cap; S4, the bottle cap is moved to the detection position of the outer wall detection unit (4), the corresponding photoelectric sensor triggers a signal, and the control unit starts the second image acquisition unit (41) according to the signal to obtain the image of the outer side of the bottle cap; S5, the bottle cap is moved from the first conveyor belt (11) to the pinching belt group (51), and the pinching belt group (51) moves the bottle cap to the detection position of the cap top detection unit (5), and the corresponding photoelectric sensor triggers a signal, and the control unit starts the third image acquisition unit (52) according to the signal to obtain an image of the top surface of the bottle cap; S6, the bottle cap is moved from the clamping belt group (51) to the second conveyor belt (12), and the second conveyor belt (12) moves the bottle cap to the detection position of the inner cap detection unit (6), and the corresponding photoelectric sensor triggers a signal. The control unit starts the fourth image acquisition unit (61) according to the signal to obtain an image of the inner side surface of the bottle cap or the side surface of the inner column.

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