Offline sampling inspection device for aluminum can packaging based on vision detection

Abstract

This utility model provides an offline sampling inspection device for aluminum can packaging based on visual inspection. It includes a visual inspection mechanism, a robotic arm, and an export mechanism. The export mechanism comprises a support, a first export component, a second export component, and an ejection component. The support is fixedly connected to an installation platform and is equipped with a first cylinder and a second cylinder. The first cylinder is connected to a sliding plate, and the top of the sliding plate has a square block and an ejection component. The second cylinder is connected to a guide block, which has a groove corresponding to the ejection component. The export mechanism can automatically export aluminum cans from the conveyor line. With the assistance of the robotic arm, it can remove aluminum cans from the conveyor line and place them on the visual inspection mechanism for packaging inspection. The entire process requires no manual intervention, effectively reducing manpower input in the production process, lowering labor costs, and meeting the enterprise's development needs for cost reduction and efficiency improvement.

Description

Technical Field

[0001] This utility model relates to the technical field of testing devices for beverage can production lines, and in particular to an offline sampling inspection device for beverage can body panels based on visual inspection. Background Technology

[0002] For the production of beverage cans (such as beer), compliance testing of the can label is a crucial step in ensuring product quality. According to relevant regulations and industry standards, the can label must accurately print legally required text (such as production location, shelf life, alcohol content, malt content, etc.) and graphic markings. The completeness and clarity of this information directly impacts the product's market circulation and consumer rights.

[0003] Inspecting the content on the can body is a crucial post-printing inspection process. With the development of visual inspection technology, this technology is now being applied to can content inspection. For example, Chinese patent application CN202420263669.9 discloses a visual inspection device for food can defects, comprising a base plate with four evenly distributed columns welded to its upper corner. An upper plate is welded to the upper end of each column, and a monitor is fixedly installed at the lower end of the upper plate. A motor is fixedly installed in the lower center of the base plate, with its shaft passing through and rotatably connected to the base plate. A steering mechanism is located at the upper end of the shaft, a support is mounted on the steering mechanism, and a clamping mechanism is mounted on the support.

[0004] However, existing can printing content inspection devices still require manual removal of the printed cans from the conveyor line and placement in the inspection device, which increases labor costs in the production process and cannot meet the development needs of enterprises to reduce costs and increase efficiency. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide an offline sampling inspection device for the printing plates of aluminum cans based on visual inspection, which can replace manual placement of printed aluminum cans at the inspection station, thereby achieving the purpose of reducing costs and increasing efficiency.

[0006] This utility model is implemented as follows: This utility model provides an offline sampling inspection device for the surface of aluminum cans based on visual inspection, including a visual inspection mechanism. The visual inspection mechanism includes: a mounting platform, a line scanning camera, and a rotating platform for placing aluminum cans. The line scanning camera and the rotating platform are both mounted on the mounting platform. The visual inspection mechanism is located on one side of the conveyor line. The sampling inspection device also includes a robotic arm and an export mechanism for exporting aluminum cans from the conveyor line. The export mechanism includes: a bracket, a first export component, a second export component, and an ejection component.

[0007] The bracket is fixedly connected to the mounting platform. Both the first and second outgoing components are connected to the bracket. From the perspective of the conveying direction of the conveyor line, the second outgoing component is located on the side of the bracket facing the front end of the conveyor line.

[0008] The first export component includes a first cylinder mounted on a bracket, with a sliding plate connected to the telescopic end of the first cylinder. A support platform is provided on the side of the conveyor line, extending to the second export component. The top of the support platform is flush with the top of the conveyor line. The sliding plate is slidably connected to the top of the support platform, and a square block is provided on the top of the sliding plate. The ejection component is located on the top of the sliding plate, and is located on the side of the square block closer to the visual inspection mechanism.

[0009] The sliding plate is provided with a tray for supporting the can on the side facing the second ejection assembly. When the sliding plate moves to the conveyor line, one of the cans moves to the top of the tray under the drive of the conveyor line, and the tray corresponds to the ejection end of the ejection assembly.

[0010] The second ejection mechanism includes a second cylinder mounted on a bracket. The telescopic end of the second cylinder is connected to a guide block. The guide block has a groove on the side facing the tray, and the groove corresponds to the ejection assembly.

[0011] Furthermore, the ejection assembly includes a third cylinder mounted on top of the sliding plate, the telescopic end of which is connected to an ejection block.

[0012] Furthermore, a guide slope is provided on the side of the guide block facing the front end of the conveyor line.

[0013] Furthermore, the robotic arm includes: a column, a pneumatic gripper, a lifting mechanism, and a translation mechanism;

[0014] The column is set on the top of the installation platform, and the translation mechanism is connected to the upper end of the column. One end of the translation mechanism is located above the visual inspection mechanism, and the other end is located above the support platform.

[0015] The lifting mechanism is connected to the translation mechanism, and the pneumatic gripper is connected to the lifting mechanism. After the pneumatic gripper picks up the can, the lifting mechanism and the translation mechanism work to move the can to the rotating platform.

[0016] Furthermore, the translation mechanism is a linear module, the lifting mechanism is a magnetically coupled rodless cylinder, the linear module has a first sliding part, the magnetically coupled rodless cylinder is connected to the first sliding part, the magnetically coupled rodless cylinder has a second sliding part, and the pneumatic gripper is fixed on the second sliding part.

[0017] Furthermore, it also includes a purging assembly for removing water droplets from the outer wall of the can. The purging assembly includes a lifting cylinder and a purging ring. The lifting cylinder is mounted on the mounting platform. The telescopic end of the lifting cylinder is connected to the purging ring, and the purging ring coincides with the axis of the rotating platform. The inner wall of the purging ring has a purging hole, which is connected to an external air source.

[0018] Furthermore, it also includes a pair of positioning components, which are set on the mounting platform and located on both sides of the rotating platform. Each positioning component includes a fourth cylinder that is fixed to the top of the mounting platform. The telescopic end of the fourth cylinder is connected to a positioning component. When the telescopic end of the fourth cylinder is extended, the positioning component contacts the outer wall of the can.

[0019] Furthermore, the positioning component includes an L-shaped connecting plate, the lower end of which is connected to the fourth cylinder, and the upper end of which has a clearance groove that matches the can. Rollers are connected to both sides of the clearance groove, and when the telescopic end of the fourth cylinder extends, the rollers contact the outer wall of the can.

[0020] The advantages of this utility model are:

[0021] 1. The export mechanism can automatically export cans from the conveyor line. With the help of a robotic arm, it can remove cans from the can conveyor line and place them on a vision inspection mechanism for layout inspection. The entire process requires no manual intervention, which effectively reduces the manpower input in the production process, lowers labor costs, and meets the development needs of enterprises to reduce costs and increase efficiency.

[0022] 2. Blowing away water droplets from the outer wall of the can using the purging component can prevent water droplets from interfering with the detection results. If water droplets are not removed from the outer wall of the can, they can cause glare and shadows when the line scan camera captures images, affecting the accuracy of the detection system in recognizing text and patterns on the surface.

[0023] 3. By positioning the can placed on top of the rotating platform using the positioning component, the center of the can can be aligned with the rotation center of the rotating platform, avoiding image distortion caused by the can's positional deviation and thus improving detection accuracy. Attached Figure Description

[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0025] Figure 1 This is a schematic diagram of the offline sampling inspection device for the body of an aluminum can based on visual inspection, as described in this utility model.

[0026] Figure 2 yes Figure 1 A partial top view of the structure shown.

[0027] Figure 3 This is a schematic diagram of the connection structure of the sliding plate, the ejection assembly, and the square block in this utility model.

[0028] Figure 4 This is a schematic diagram of the guide block structure in this utility model.

[0029] Figure 5 This is a schematic diagram of the connection structure of the installation platform, purging component and positioning component in this utility model.

[0030] Figure 6 This is a schematic diagram of the structure of the first cylinder after its telescopic end has been extended.

[0031] Figure 7 This is a schematic diagram of the structure of the second cylinder after its telescopic end has extended.

[0032] Figure 8 This is a schematic diagram of the structure of the third cylinder after its telescopic end has extended.

[0033] Explanation of the labels in the diagram:

[0034] 1. Visual inspection mechanism; 11. Mounting platform; 12. Line scan camera; 13. Rotating platform; 2. Robotic arm; 21. Column; 22. Pneumatic gripper; 23. Lifting mechanism; 231. Second sliding part; 24. Translation mechanism; 241. First sliding part; 3. Outgoing mechanism; 31. Bracket; 32. First outgoing assembly; 321. First cylinder; 322. Sliding plate; 33. Second outgoing assembly; 331. Second cylinder; 332. Guide block; 3321. Groove; 3322. Guide slope; 34. Push-out assembly; 341. Third cylinder; 342. Push-out block; 35. Square block; 36. Support plate; 4. Support platform; 5. Blowing assembly; 51. Lifting cylinder; 52. Blowing ring; 6. Positioning assembly; 61. Fourth cylinder; 62. Connecting plate; 63. Roller. Detailed Implementation

[0035] Please see Figures 1 to 8 This utility model provides an offline sampling inspection device for aluminum can packaging based on visual inspection, including a visual inspection mechanism 1. The visual inspection mechanism 1 includes: a mounting platform 11, a line scanning camera 12, and a rotating platform 13 for placing aluminum cans. The line scanning camera 12 and the rotating platform 13 are both mounted on the mounting platform 11. The visual inspection mechanism 1 is located on one side of the conveyor line 20. The sampling inspection device also includes a robotic arm 2 and an export mechanism 3 for exporting aluminum cans from the conveyor line 20. The export mechanism 3 includes: a bracket 31, a first export component 32, a second export component 33, and an ejection component 34.

[0036] The bracket 31 is fixedly connected to the mounting platform 11. The first export component 32 and the second export component 33 are both connected to the bracket 31. From the perspective of the conveying direction of the conveying line 20, the second export component 33 is located on the side of the bracket 31 facing the front end of the conveying line 20.

[0037] The first export component 32 includes a first cylinder 321 mounted on a bracket 31. The telescopic end of the first cylinder 321 is connected to a sliding plate 322. A support platform 4 is mounted on the side of the conveyor line 20. The support platform 4 extends to the second export component 33. The top of the support platform 4 is flush with the top of the conveyor line 20. The sliding plate 322 is slidably connected to the top of the support platform 4. A square block 35 is mounted on the top of the sliding plate 322. The ejection component 34 is mounted on the top of the sliding plate 322 and is mounted on the side of the square block 35 closer to the visual inspection mechanism 1.

[0038] The sliding plate 322 is provided with a tray 36 for supporting the can on the side facing the second ejector assembly 33. When the sliding plate 322 moves to the conveyor line 20, one of the cans moves to the top of the tray 36 under the drive of the conveyor line 20, and the tray 36 corresponds to the ejector end of the ejector assembly 34. The tray 36 is a thin plate structure with a thickness of less than or equal to 1 mm, and the side of the tray 36 facing the front end of the conveyor line 20 has a wedge-shaped surface. This wedge-shaped surface makes the side of the tray 36 facing the front end of the conveyor line 20 form a sharp guide. After the can on the conveyor line 20 contacts the guide, under the action of inertia, the can slide along the wedge-shaped surface, so that the can moves to the top of the tray 36 and contacts the ejector assembly 34.

[0039] The second ejection mechanism 3 includes a second cylinder 331 mounted on a bracket 31. A guide block 332 is connected to the telescopic end of the second cylinder 331. A groove 3321 is formed on the side of the guide block 332 facing the tray 36, and this groove 3321 corresponds to the ejection assembly 34. A gap matching the diameter of the can is maintained between the guide block 332 and the ejection assembly 34.

[0040] like Figure 2 As shown, along the conveying direction of the conveyor line 20, there are several rows of vertically arranged aluminum cans. When an aluminum can is ejected from the conveyor line 20, the telescopic end of the first cylinder 321 extends, driving the sliding plate 322, the square block 35 mounted on the top surface of the sliding plate 322, and the ejection assembly 34 to move onto the conveyor line 20. The aluminum cans in the same horizontal row as the square block 35 are pushed aside by the square block 35. As the conveyor line 20 operates, the next aluminum can moves onto the pallet 36 via the wedge-shaped surface.

[0041] After the extension end of the first cylinder 321 extends for a predetermined time (e.g., 1 second), the extension end of the second cylinder 331 extends, moving the guide block 332 onto the conveyor line 20 to separate the can on the pallet 36 from other cans on the conveyor line 20. Subsequently, the first cylinder 321 and the second cylinder 331 retract together to move the can on the pallet 36 to the outside of the conveyor line 20. The robotic arm 2 picks up the can and places it on the rotating platform 13.

[0042] The rotating platform 13 is driven by a motor. After the can is placed on the rotating platform 13, the motor drives the rotating platform 13 to rotate one revolution, and the line scan camera 12 collects and detects the content printed on the outer wall of the can.

[0043] Specifically, the ejection assembly 34 includes a third cylinder 341 mounted on top of the sliding plate 322, with an ejection block 342 connected to the telescopic end of the third cylinder 341. After the content on the outer wall of the can is collected and detected, the robot arm 2 moves the can back onto the tray 36. At this time, the telescopic end of the third cylinder 341 extends, pushing the can into the groove 3321 via the ejection block 342. At this point, the bottom of the can contacts the support platform 4. After the telescopic end of the second cylinder 331 extends, the can is guided back onto the conveyor line 20, which then moves the can to the next process.

[0044] Specifically, a guide ramp 3322 is provided on the side of the guide block 332 facing the front end of the conveyor line 20. If the guide block 332 faces the plane of the front end of the conveyor line 20, when the guide block 332 moves onto the conveyor line 20, it will obstruct the aluminum cans being transported from the front end to the rear end of the conveyor line 20, causing the aluminum cans to crowd together and resulting in phenomena such as bottle tipping. However, by providing a guide ramp 3322 on the side of the guide block 332 facing the front end of the conveyor line 20, as... Figure 7 As shown, it can guide the cans near the support platform 4 to other columns, preventing the cans from crowding together and causing things like bottles tipping over.

[0045] Specifically, the robotic arm 2 includes: a column 21, a pneumatic gripper 22, a lifting mechanism 23, and a translation mechanism 24;

[0046] The column 21 is set on the top of the installation platform 11, and the translation mechanism 24 is connected to the upper end of the column 21. One end of the translation mechanism 24 is located above the visual inspection mechanism 1, and the other end is located above the support platform 4.

[0047] The lifting mechanism 23 is connected to the translation mechanism 24, and the pneumatic gripper 22 is connected to the lifting mechanism 23. After the pneumatic gripper 22 grips the can, the lifting mechanism 23 and the translation mechanism 24 work to move the can onto the rotating platform 13.

[0048] Specifically, the translation mechanism 24 is a linear module, the lifting mechanism 23 is a magnetically coupled rodless cylinder, the linear module has a first sliding part 241, the magnetically coupled rodless cylinder is connected to the first sliding part 241, the magnetically coupled rodless cylinder has a second sliding part 231, and the pneumatic gripper 22 is fixed on the second sliding part 231.

[0049] Both the linear module and the magnetically coupled rodless cylinder are existing products and can be purchased directly from the market. Both the linear module and the magnetically coupled rodless cylinder are equipped with two limit switches. For the linear module, one limit switch is set at the left limit position of the linear module's stroke. After the first sliding part 241 moves to the left limit position, this limit switch senses the first sliding part 241, and the control system controls the linear module to stop operating. At this time, the pneumatic gripper 22 is exactly above the rotating platform 13. Similarly, the other limit switch is set at the right limit position of the linear module's stroke. After this limit switch senses the first sliding part 241, the control system controls the linear module to stop operating. At this time, the pneumatic gripper 22 is exactly above the pallet 36.

[0050] For the two limit switches of the magnetically coupled rodless cylinder, one of the limit switches is set at the upper limit position of the magnetically coupled rodless cylinder stroke. After the limit switch senses the second sliding part 231, the control system controls the linear module to move.

[0051] Another limit switch is set at the lower limit position of the magnetically coupled rodless cylinder stroke. After the limit switch senses the second sliding part 231, the control system controls the pneumatic gripper 22 to move to grip or release the can.

[0052] Specifically, it also includes a blowing assembly 5 for removing water droplets from the outer wall of the can. The blowing assembly 5 includes a lifting cylinder 51 and a blowing ring 52. The lifting cylinder 51 is mounted on the mounting platform 11, and its telescopic end is connected to the blowing ring 52. The blowing ring 52 coincides with the axis of the rotating platform 13. The inner wall of the blowing ring 52 has blowing holes connected to an external air source. Blowing away the water droplets from the outer wall of the can by the blowing assembly 5 avoids interference with the detection results. If the water droplets on the outer wall of the can are not removed, they can cause glare and shadows when the line scan camera 12 acquires images, affecting the accuracy of the detection system in recognizing text and patterns on the surface.

[0053] After the can is placed on the rotating platform 13, the telescopic end of the lifting cylinder 51 extends to drive the blowing ring 52 to move upward from the bottom of the can to remove the water droplets adhering to the outer wall of the can.

[0054] Specifically, it also includes paired positioning components 6, which are mounted on the mounting platform 11 and located on both sides of the rotating platform 13. Each positioning component 6 includes a fourth cylinder 61 fixed to the top of the mounting platform 11. The telescopic end of the fourth cylinder 61 is connected to a positioning component. When the telescopic end of the fourth cylinder 61 extends, the positioning component contacts the outer wall of the can. Because the can is lightweight, its position may shift after being blown by the purge ring 52. Therefore, before testing, both fourth cylinders 61 extend simultaneously, and the positioning component adjusts the center of the can to be aligned with the center of the rotating platform 13.

[0055] Specifically, the positioning component includes a connecting plate 62 with an L-shaped cross-section. The lower end of the connecting plate 62 is connected to the fourth cylinder 61. The upper end of the connecting plate 62 has a clearance groove that matches the aluminum can. Rollers 63 are connected to both sides of the clearance groove. When the telescopic end of the fourth cylinder 61 extends, the rollers 63 contact the outer wall of the aluminum can.

[0056] One specific application of this utility model is:

[0057] During random inspection, the telescopic end of the first cylinder 321 extends, driving the sliding plate 322, the square block 35 mounted on the top surface of the sliding plate 322, and the ejection assembly 34 to move onto the conveyor line 20. The cans in the same horizontal row as the square block 35 are pushed aside by the square block 35. As the conveyor line 20 operates, the first can 10 moves across the wedge-shaped surface onto the tray 36 and comes into contact with the ejection assembly 34.

[0058] After the telescopic end of the first cylinder 321 extends for a predetermined time (e.g., 1 second), the telescopic end of the second cylinder 331 extends, causing the guide block 332 to move onto the conveyor line 20. Since the conveyor line 20 continuously transports cans, when the cans are on the conveyor line 20 at the position of the guide block 332, they are guided to other rows of cans after contacting the guide ramp 3322, preventing cans from crowding together and causing tipping. When the guide block 332 moves onto the conveyor line 20, it separates the first can 10 on the pallet 36 from other cans on the conveyor line 20. Subsequently, the first cylinder 321 and the second cylinder 331 retract together to move the first can 10 on the pallet 36 to the outside of the conveyor line 20.

[0059] After the first cylinder 321 and the second cylinder 331 retract to their initial positions, the control system controls the lifting mechanism 23 to move, causing the pneumatic gripper 22 to descend and grip the first can 10. Subsequently, the lifting mechanism 23 and the translation mechanism 24 move the pneumatic gripper 22 to the rotating platform 13 to place the first can 10 on top of the rotating platform 13.

[0060] The control system controls the extension end of the lifting cylinder 51 to extend, thereby driving the blowing ring 52 to move upward from the bottom of the first can 10 to remove water droplets adhering to the outer wall of the first can 10.

[0061] After the water droplets are removed, the control system controls the two fourth cylinders 61 to extend simultaneously, adjusting the center of the first can 10 to be aligned with the center of the rotating platform 13 via the positioning component. Then, the motor drives the rotating platform 13 to rotate one revolution, and the line scan camera 12 collects and detects the content printed on the outer wall of the first can 10.

[0062] After the content on the outer wall of the first aluminum can 10 is collected and inspected, the robotic arm 2 moves the first aluminum can 10 back onto the tray 36. At this time, the telescopic end of the third cylinder 341 extends, pushing the first aluminum can 10 into the groove 3321 via the push block 342. At this time, the bottom of the first aluminum can 10 contacts the support platform 4. After the telescopic end of the second cylinder 331 extends, the guide block 332 moves back onto the conveyor line 20, and also moves the first aluminum can 10 located in the groove 3321 of the guide block 332 onto the conveyor line 20, thus completing one sampling inspection. After a preset time interval, the control system controls the first cylinder 321, the second cylinder 331, the robotic arm 2, the lifting cylinder 51, the fourth cylinder 61, and the third cylinder 341 to operate, so as to complete another sampling inspection.

[0063] The advantages of this invention are as follows: The export mechanism 3 can automatically export the cans from the conveyor line 20, and with the cooperation of the robotic arm 2, it can remove the cans from the can conveyor line 20 and place them on the vision inspection mechanism 1 for layout inspection. The entire process requires no manual intervention, effectively reducing manpower input in the production process, lowering labor costs, and meeting the enterprise's development needs for cost reduction and efficiency improvement. The blowing component 5 blows away water droplets on the outer wall of the can, preventing water droplets from interfering with the inspection results. If water droplets are not removed from the outer wall of the can, they can cause glare, shadows, and other interference when the line scan camera 12 acquires images, affecting the accuracy of the inspection system in recognizing text and patterns on the layout. The positioning component 6 positions the cans placed on top of the rotating platform 13, ensuring that the center of the can coincides with the rotation center of the rotating platform 13, avoiding image distortion caused by can positional deviation, and improving inspection accuracy.

[0064] While specific embodiments of the present invention have been described above, those skilled in the art should understand that the specific embodiments described are merely illustrative and not intended to limit the scope of the present invention. Equivalent modifications and variations made by those skilled in the art in accordance with the spirit of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A visual inspection-based offline sampling inspection device for aluminum can packaging, comprising a visual inspection mechanism, wherein the visual inspection mechanism includes: The device comprises an installation platform, a line scanning camera, and a rotating platform for placing aluminum cans, wherein the line scanning camera and the rotating platform are both mounted on the installation platform. The visual inspection mechanism is located on one side of the conveyor line. The sampling device further includes a robotic arm and an export mechanism for removing aluminum cans from the conveyor line. The export mechanism includes a bracket, a first export component, a second export component, and an ejection component. The bracket is fixedly connected to the mounting platform. Both the first and second outgoing components are connected to the bracket. From the perspective of the conveying direction of the conveyor line, the second outgoing component is located on the side of the bracket facing the front end of the conveyor line. The first export component includes a first cylinder mounted on a bracket, with a sliding plate connected to the telescopic end of the first cylinder. A support platform is provided on the side of the conveyor line, extending to the second export component. The top of the support platform is flush with the top of the conveyor line. The sliding plate is slidably connected to the top of the support platform, and a square block is provided on the top of the sliding plate. The ejection component is located on the top of the sliding plate, and is located on the side of the square block closer to the visual inspection mechanism. The sliding plate is provided with a tray for supporting the can on the side facing the second ejection assembly. When the sliding plate moves to the conveyor line, one of the cans moves to the top of the tray under the drive of the conveyor line, and the tray corresponds to the ejection end of the ejection assembly. The second ejection assembly includes a second cylinder mounted on a bracket. The telescopic end of the second cylinder is connected to a guide block. The guide block has a groove on the side facing the tray, and the groove corresponds to the ejection assembly.

2. The offline sampling inspection device for aluminum can packaging based on visual inspection as described in claim 1, characterized in that: The ejection assembly includes a third cylinder mounted on top of the sliding plate, and the telescopic end of the third cylinder is connected to an ejection block.

3. The offline sampling inspection device for aluminum can packaging based on visual inspection as described in claim 1, characterized in that: The guide block has a guide ramp on the side facing the front end of the conveyor line.

4. The offline sampling inspection device for aluminum can packaging based on visual inspection as described in claim 1, characterized in that: The robotic arm includes: a column, a pneumatic gripper, a lifting mechanism, and a translation mechanism; The column is set on the top of the installation platform, and the translation mechanism is connected to the upper end of the column. One end of the translation mechanism is located above the visual inspection mechanism, and the other end is located above the support platform. The lifting mechanism is connected to the translation mechanism, and the pneumatic gripper is connected to the lifting mechanism. After the pneumatic gripper picks up the can, the lifting mechanism and the translation mechanism work to move the can to the rotating platform.

5. The offline sampling inspection device for aluminum can packaging based on visual inspection as described in claim 4, characterized in that: The translation mechanism is a linear module, the lifting mechanism is a magnetically coupled rodless cylinder, the linear module has a first sliding part, the magnetically coupled rodless cylinder is connected to the first sliding part, the magnetically coupled rodless cylinder has a second sliding part, and the pneumatic gripper is fixed on the second sliding part.

6. The offline sampling inspection device for aluminum can packaging based on visual inspection as described in claim 1, characterized in that: It also includes a purging assembly for removing water droplets from the outer wall of an aluminum can. The purging assembly includes a lifting cylinder and a purging ring. The lifting cylinder is mounted on an installation platform. The telescopic end of the lifting cylinder is connected to the purging ring, and the purging ring coincides with the axis of the rotating platform. The inner wall of the purging ring has a purging hole, which is connected to an external air source.

7. The offline sampling inspection device for aluminum can packaging based on visual inspection as described in claim 1, characterized in that: It also includes a pair of positioning components, which are set on the mounting platform and located on both sides of the rotating platform. Each positioning component includes a fourth cylinder that is fixed to the top of the mounting platform. The telescopic end of the fourth cylinder is connected to a positioning component. When the telescopic end of the fourth cylinder is extended, the positioning component contacts the outer wall of the can.

8. The offline sampling inspection device for aluminum can packaging based on visual inspection as described in claim 7, characterized in that: The positioning component includes an L-shaped connecting plate. The lower end of the connecting plate is connected to the fourth cylinder. The upper end of the connecting plate has a clearance groove that matches the aluminum can. Rollers are connected to both sides of the clearance groove. When the extension end of the fourth cylinder extends, the rollers contact the outer wall of the aluminum can.

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