Off-line sampling inspection equipment for appearance quality of metal can

Abstract

The invention discloses metal can appearance quality off-line sampling inspection equipment, and relates to the technical field of metal packaging container quality control, the metal can appearance quality off-line sampling inspection equipment comprises an outer cover, a sampling inspection module and a power supply module, the sampling inspection module and the power supply module are respectively located in an upper room and a lower room, and the outer wall of the outer cover is movably connected with a control end; a metal can is grabbed to a second stage module by a manipulator to be weighed, after weighing is completed, the metal can is grabbed to a photographing station module by the manipulator to be photographed by a camera module, after photographing is completed, the metal can is grabbed by the manipulator, turned over and then placed on the photographing station module again, then photographing is carried out again, and then the next process is carried out. The metal can appearance quality detection speed and accuracy are remarkably improved, the single-time detection time is shortened to be within several seconds, the initial investment burden of an enterprise is greatly reduced, the purchase cost of a single set of equipment is only about half of that of an online detection device of the same level, and technology popularization and promotion are facilitated.

Description

Technical Field

[0001] The present invention relates to the technical field of metal packaging container quality control, in particular to offline sampling inspection equipment for the appearance quality of metal cans. Background Art

[0002] In the metal can production process, appearance quality inspection is a critical step in ensuring product quality. As important packaging containers in industries such as food and chemicals, the appearance of metal cans not only affects the product's aesthetics but also directly impacts key performance factors such as sealing and corrosion resistance. Therefore, metal cans undergo rigorous appearance quality inspections throughout the production process to ensure the final product's compliance.

[0003] Traditional methods for inspecting the appearance quality of metal cans fall into two main categories: manual visual inspection and automated inspection systems based on machine vision. Manual visual inspection relies on the inspector's experience and vision. While it can identify most obvious defects, such as scratches, dents, and rust, this method has numerous shortcomings. On the one hand, manual inspection is inefficient and cannot meet the inspection needs of large-scale production lines. On the other hand, inspection results are easily influenced by subjective factors, and there may be significant differences between different inspectors, making it difficult to ensure the accuracy and consistency of inspection results. Automated inspection systems based on machine vision, on the other hand, utilize high-precision image acquisition and processing technology to quickly and accurately inspect the appearance quality of metal cans. However, due to the complexity of machine vision algorithms and the high computational effort involved, the systems are expensive, increasing production costs. Therefore, the present invention proposes offline sampling equipment for inspecting the appearance quality of metal cans. Summary of the Invention

[0004] The purpose of the present invention is to provide an offline sampling inspection device for the appearance quality of metal cans, so as to solve the problem that the traditional metal can appearance quality inspection methods proposed in the above background technology are mainly divided into two categories: manual visual inspection and automatic inspection system based on machine vision. Manual visual inspection relies on the experience and vision of the inspector. Although it can identify most obvious defects such as scratches, dents, rust, etc., this method has many shortcomings. On the one hand, manual inspection is inefficient and difficult to meet the inspection needs of large-scale production lines; on the other hand, the inspection results are easily affected by subjective factors, and there may be large differences between different inspectors, resulting in the accuracy and consistency of the inspection results being difficult to guarantee. The automatic inspection system based on machine vision can achieve rapid and accurate inspection of the appearance quality of metal cans through high-precision image acquisition and processing technology. However, due to the complexity of the machine vision algorithm and the large amount of calculation, the system is expensive, which increases the production cost.

[0005] In order to achieve the above object, the present invention provides the following technical solutions: The offline sampling inspection equipment for the appearance quality of metal cans includes an outer cover, a sampling inspection module and a power supply module. The interior of the outer cover is divided into an upper chamber and a lower chamber by a horizontal workstation fixing plate. The sampling inspection module and the power supply module are respectively located in the upper chamber and the lower chamber. The outer wall of the outer cover is movably connected to a control end. The sampling inspection module includes a first-stage module, a second-stage module and a third-stage module. The first-stage module, the second-stage module and the third-stage module are distributed in a process flow. The upper chamber is also movably equipped with a conveying mechanism for conveying metal cans to a specific workstation. A rejection component is provided in the upper chamber next to the second-stage module.

[0006] Optionally, the conveying mechanism includes a support frame, a transverse movement module, and a grabbing module arranged on the workstation fixed plate, the transverse movement module is arranged on the end surface of the support frame, and the grabbing module is slidably arranged on the front side of the transverse movement module.

[0007] Optionally, the grabbing module includes a sliding platform, an adapter plate, a cylinder fixing plate, a grabbing cylinder and a grabbing hand. The front end face of the sliding platform is fixedly connected to the adapter plate, the cylinder fixing plate is vertically connected to the adapter plate, the bottom of the cylinder fixing plate is fixedly installed with a grabbing cylinder, and the side output end of the grabbing cylinder is correspondingly connected to the grabbing hand.

[0008] Optionally, the first stage module includes a first support column, a lifting adjustment plate and a manipulator, the first support column is arranged on the top of the workstation fixed plate, the lifting adjustment plate is correspondingly arranged on the side of the first support column, and the manipulator is fixedly installed on the top of the lifting adjustment plate.

[0009] Optionally, the second stage module includes a leveling fixing plate, a leveling support rod, a balance and a windshield, the leveling fixing plate is arranged beside the first support column, the leveling support rods are distributed at four corners on the upper end surface of the leveling fixing plate, the top of the leveling support rod is fixedly installed with a balance, and the outer side of the balance is surrounded by a windshield.

[0010] Optionally, the third stage module includes a camera module, a photo station module and an alignment module. The camera module is fixedly installed on the upper end surface of the station fixing plate. The photo station module is provided on the opposite side of the camera module. The alignment module for correcting the metal can is provided next to the photo station module.

[0011] Optionally, the camera module includes a second support column, a slide fixing plate, a slide, a slider, a camera fixing block, a camera, a light source fixing shaft, a light source fixing block and a light mask. The second support column is arranged on the top of the work station fixing plate, the top of the second support column is provided with a slide fixing plate, the upper end surface of the slide fixing plate is provided with a slide, a slider is provided on the slide sliding on the slide, the top of the slider is fixedly installed with a camera through the camera fixing block, the light source fixing shaft is arranged beside the second support column, the top side of the light source fixing shaft is provided with a light source fixing block, and the light mask is fixedly installed on the light source fixing block.

[0012] Optionally, the photo-taking station module includes a driving motor, a rotating platform seat and a rotating positioning table. The driving motor is fixedly installed on the bottom of the station fixing plate through a mounting plate. The output end of the driving motor passes through the top of the station fixing plate and is connected to the rotating platform seat. The rotating platform seat is fixedly connected to the rotating positioning table for placing the metal can through a rotating shaft.

[0013] Optionally, the rejection assembly includes a slide body, a slide support plate and a slide guide rod. The slide body is arranged on the side of the second-stage module through the slide support plate, and a slide guide rod is provided inside the slide body.

[0014] Optionally, a pre-processing module for pre-processing the metal can is provided beside the outer cover.

[0015] The beneficial effects of the present invention are: The present invention uses a metal can to be grabbed by a robot and taken to the second-stage module for weighing. After weighing, the robot is used to grab the metal can to the photo-taking station module to be photographed by the camera module. After the photographing is completed, the robot is used to grab and turn the metal can over and put it back into the photo-taking station module. Then, it takes another photo and enters the next process. The speed and accuracy of the metal can appearance quality inspection are significantly improved, and the single inspection time is shortened to less than a few seconds, which greatly reduces the company's initial investment burden. The purchase cost of a single set of equipment is only about half of the online inspection device of the same level, which is conducive to promoting the popularization and promotion of technology, and the operation is simple and quick. Even non-professionals can quickly grasp the essentials, reducing training time and expenses. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the off-line sampling inspection equipment for the appearance quality of metal cans of the present invention; Figure 2 This is a schematic structural diagram of the off-line sampling inspection device for the appearance quality of metal cans according to the present invention from another perspective; Figure 3 This is a schematic diagram of the structure of the present invention after removing the outer cover; Figure 4 Schematic diagram of the structure of the sampling inspection module in the present invention; Figure 5 This is a structural diagram of the sampling inspection module in the present invention from another perspective; Figure 6 for Figure 5 Enlarged view of point A in the middle; Figure 7 for Figure 4 Enlarged view of point B in the middle; Figure 8 Schematic diagram of the structure of the second stage module in the present invention; Figure 9 for Figure 5 Enlarged view of point C in the middle; Figure 10 for Figure 5 Enlarged view of point D in the middle.

[0017] The numbers in the figure are: 1. Outer cover; 101. Station fixing plate; 102. Upper chamber; 103. Lower chamber; 2. Control terminal; 3. Power supply module; 4. Conveying mechanism; 401. Support frame; 402. Transverse movement module; 403. Grabbing module; 4031. Sliding platform; 4032. Adapter plate; 4033. Cylinder fixing plate; 4034. Grabbing cylinder; 4035. Grabbing arm; 5. First stage module; 501. First support column; 502. Lifting adjustment plate; 503. Manipulator; 6. Second stage module; 601. Leveling fixing plate; 602. Leveling support rod; 603. Balance; 604. Wind shield; 7. Third-stage module; 701, camera module; 7011, second support column; 7012, slide fixing plate; 7013, slide; 7014, slider; 7015, camera fixing block; 7016, camera; 7017, light source fixing shaft; 7018, light source fixing block; 7019, photomask; 702, photo station module; 7021, drive motor; 7022, rotating platform base; 7023, rotating positioning platform; 703, alignment module; 8. Removal assembly; 801. Slide body; 802. Slide support plate; 803. Slide guide rod; 9. Preprocessing module. DETAILED DESCRIPTION

[0018] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods.

[0019] The device of the present invention will be described below in conjunction with preferred embodiments thereof.

[0020] See also Figure 1-10 As shown, the offline sampling inspection equipment for the appearance quality of metal cans includes an outer cover 1, a sampling inspection module and a power supply module 3. The interior of the outer cover 1 is divided into an upper chamber 102 and a lower chamber 103 by a horizontal workstation fixing plate 101. The sampling inspection module and the power supply module 3 are respectively located in the upper chamber 102 and the lower chamber 103. The outer wall of the outer cover 1 is movably connected to the control terminal 2. The sampling inspection module includes a first-stage module 5, a second-stage module 6 and a third-stage module 7. The first-stage module 5, the second-stage module 6 and the third-stage module 7 are distributed in a process flow pattern. A conveying mechanism 4 for conveying metal cans to a specific workstation is also movably installed in the upper chamber 102. A rejection component 8 is provided next to the second-stage module 6 in the upper chamber 102.

[0021] Furthermore, a pre-processing module 9 for pre-processing the metal can is provided beside the outer cover 1 .

[0022] In another embodiment provided by the present invention, Figure 5 and 6 As shown, the conveying mechanism 4 includes a support frame 401, a transverse module 402, and a grabbing module 403 arranged on the workstation fixed plate 101. The transverse module 402 is arranged on the end face of the support frame 401, and the grabbing module 403 is slidably arranged on the front side of the transverse module 402.

[0023] The grabbing module 403 includes a sliding platform 4031, an adapter plate 4032, a cylinder fixing plate 4033, a grabbing cylinder 4034 and a grabbing hand 4035. The front end face of the sliding platform 4031 is fixedly connected to the adapter plate 4032, the cylinder fixing plate 4033 is vertically connected to the adapter plate 4032, the bottom of the cylinder fixing plate 4033 is fixedly installed with the grabbing cylinder 4034, and the side output end of the grabbing cylinder 4034 is correspondingly connected to the grabbing hand 4035.

[0024] Specifically, the conveying mechanism 4 is in standby state, and the grabbing module 403 is in the initial position. When the metal can is transported to the entrance of the conveying mechanism 4, the system starts, and the transverse module 402 slides on the support frame 401 to move the grabbing module 403 above the metal can. The grabbing cylinder 4034 of the grabbing module 403 is started, and the metal can is grabbed by the grabbing hand 4035. The transverse module 402 moves again to move the grabbing module 403 and the metal can above the specific workstation of the first-stage module 5. The grabbing cylinder 4034 retracts, and the grabbing hand 4035 releases the metal can to complete the conveying.

[0025] In another embodiment provided by the present invention, Figure 4-10As shown, the first stage module 5 includes a first support column 501, a lifting and adjusting plate 502 and a manipulator 503. The first support column 501 is arranged on the top of the work station fixed plate 101, the lifting and adjusting plate 502 is correspondingly arranged on the side of the first support column 501, and the manipulator 503 is fixedly installed on the top of the lifting and adjusting plate 502.

[0026] Furthermore, the second stage module 6 includes a leveling fixing plate 601, a leveling support rod 602, a balance 603 and a wind shield 604. The leveling fixing plate 601 is arranged beside the first support column 501, and the leveling support rods 602 are distributed at four corners on the upper end surface of the leveling fixing plate 601. The balance 603 is fixedly installed on the top of the leveling support rod 602, and a wind shield 604 is provided around the outer side of the balance 603.

[0027] Furthermore, the third stage module 7 includes a camera module 701, a photographing station module 702, and an alignment module 703. The camera module 701 is fixedly mounted on the upper end surface of the station fixing plate 101. The photographing station module 702 is provided opposite the camera module 701. The alignment module 703 for aligning the metal can is provided next to the photographing station module 702. The camera module 701 includes a second support column 7011, a slide fixing plate 7012, a slide 7013, a slider 7014, a camera fixing block 7015, a camera 7016, a light source fixing shaft 7017, a light source fixing block 7018 and a light shield 7019. The second support column 7011 is arranged on the top of the station fixing plate 101, and the slide fixing plate 7012 is provided on the top of the second support column 7011. The upper end surface of the slide fixing plate 7012 is equipped with a slide 7013, and a slider 7014 is slidably provided on the slide 7013. The top of the slider 7014 is fixedly installed with the camera 7016 through the camera fixing block 7015. The light source fixing shaft 7017 is arranged beside the second support column 7011. The light source fixing block 7018 is provided on the top side of the light source fixing shaft 7017. The light shield 7019 is fixedly installed on the light source fixing block 7018. The photo-taking station module 702 includes a drive motor 7021, a rotating platform seat 7022 and a rotating positioning platform 7023. The drive motor 7021 is fixedly installed on the bottom of the station fixing plate 101 through a mounting plate. The output end of the drive motor 7021 passes through the top of the station fixing plate 101 and is connected to the rotating platform seat 7022. The rotating platform seat 7022 is fixedly connected to the rotating positioning platform 7023 for placing the metal can through a rotating shaft.

[0028] Specifically, the manipulator 503 is located at the initial position. When the conveying mechanism 4 conveys the metal can to a specific workstation, the manipulator 503 grabs the metal can, and then the manipulator 503 rises and lifts the metal can above the balance 603 of the second-stage module 6. The manipulator 503 places the metal can on the balance 603. When the manipulator 503 places the metal can on the balance 603, the balance 603 starts weighing. After the weighing is completed, the system records the weight data for subsequent analysis. The windshield 604 protects the balance 603 from external interference. The balance 603 sends a signal to the manipulator 503, ready to The metal can is grabbed again, and the robot 503 descends and grabs the weighed metal can, ready to be sent to the third stage module 7. The robot 503 places the metal can on the rotating positioning table 7023, and the alignment module 703 is started to calibrate the position of the metal can to ensure the accuracy of the photo. Then the camera module 701 is started and the appearance of the metal can is photographed through the camera 7016. After the shooting is completed, the robot 503 is used to grab and flip the metal can and put it back on the rotating positioning table 7023. The camera module 701 takes another photo of the appearance of the flipped metal can. The system records the data of the two photos for subsequent quality analysis.

[0029] Furthermore, the rejection component 8 includes a slide body 801, a slide support plate 802 and a slide guide rod 803. The slide body 801 is arranged on the side of the second stage module 6 through the slide support plate 802, and a slide guide rod 803 is provided inside the slide body 801.

[0030] Specifically, when the system detects that there is a quality problem with the metal can, it sends a rejection instruction to the rejection component 8 according to the preset rules and thresholds. After receiving the rejection instruction, the rejection component 8 starts the corresponding driving mechanism, and the slide body 801 guides the problematic metal can along the predetermined path to the rejection area through the slide guide rod 803. In the rejection area, the problematic metal can can be removed from the production line through an external pushing mechanism, airflow or other means.

[0031] During use, the metal cans that need to be inspected are pre-processed in advance through the pre-processing module 9, and then the grabbing module 403 is connected to the transverse module 402 through the sliding platform 4031 and the adapter plate 4032. When the metal can is transported to the entrance of the conveying mechanism 4, the system receives a start signal, and the transverse module 402 slides on the guide rail of the support frame 401, driving the grabbing module 403 to move toward the metal can position. When the grabbing module 403 reaches above the metal can, the grabbing cylinder 4034 is started, the piston rod is extended, and the grabbing hand 4035 is pushed by the cylinder piston rod to grab the metal can. After the grabbing module 403 grabs the metal can, the transverse module 402 moves again to move the grabbing module 403 and the metal can to the specific working position of the first stage module 5. When the grabbing module 403 reaches above a specific workstation, the grabbing cylinder 4034 retracts, the piston rod is retracted, and the grabbing hand 4035 releases the metal can and places it at the designated position of the first-stage module 5. The manipulator 503 is installed on the first support column 501 through the lifting adjustment plate 502 and is in a stationary state, waiting for system instructions. When the system issues a grabbing instruction, the manipulator 503 descends above the metal can through the lifting movement of the lifting adjustment plate 502, and the grabbing mechanism of the manipulator 503 is started to grab the metal can. After the manipulator 503 grabs the metal can, it lifts the metal can to above the balance 603 of the second-stage module 6 through the lifting movement of the lifting adjustment plate 502. When the manipulator 503 reaches above the balance 603, the grabbing mechanism Loosen and place the metal can on the balance 603. The balance 603 is installed on the leveling fixed plate 601 through the leveling support rod 602. When the metal can is placed on the balance 603, the balance 603 starts weighing and measures the weight of the metal can through the sensor. After weighing is completed, the system records the weight data and stores it in the database for subsequent analysis. The balance 603 sends a signal that the weighing is completed to the system, and the system prepares to send a grabbing instruction to the manipulator 503. After receiving the grabbing instruction, the manipulator 503 descends to the top of the balance 603 through the lifting movement of the lifting adjustment plate 502. The grabbing mechanism of the manipulator 503 is started, and it grabs the weighed metal can and prepares to send it to the third stage module 7 to prepare for taking pictures. The camera module 701 uses the second support The support column 7011 and the slide fixing plate 7012 are installed on the station fixing plate 101. The photo station module 702 is connected to the station fixing plate 101 through the driving motor 7021 and the rotating platform seat 7022. The rotating positioning platform 7023 is used to place the metal can. The alignment module 703 is ready to correct the position of the metal can. The manipulator 503 places the metal can on the rotating positioning platform 7023. The alignment module 703 is started. The position deviation of the metal can is detected by the sensor and the position of the metal can is corrected by the adjustment mechanism. The camera module 701 is started. The slide 7013 drives the slider 7014 and the camera 7016 on the camera fixing block 7015 to move to the photo taking position. The camera 7016 takes a photo of the appearance of the metal can. The manipulator 503 grabs the metal can again.By rotating or flipping the can, it is repositioned on the rotary positioning table 7023. The camera module 701 is activated again to take a photo of the flipped can's appearance. The system records the data from both photos, including the photos and possible image processing results, for subsequent quality analysis. This significantly improves the speed and accuracy of metal can appearance quality inspection, shortening the single inspection time to less than a few seconds and significantly reducing the company's initial investment burden. The purchase cost of a single set of equipment is only about half of that of similar online inspection devices, which is conducive to promoting the popularization and promotion of technology. The simple and quick operation allows even non-professionals to quickly grasp the essentials, reducing training time and expenses.

[0032] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions merely illustrate the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. Offline sampling inspection equipment for metal can appearance quality, characterized by: The invention comprises an outer cover (1), a sampling inspection module and a power supply module (3); the outer cover (1) is divided into an upper chamber (102) and a lower chamber (103) by a horizontally arranged workstation fixing plate (101); the sampling inspection module and the power supply module (3) are respectively located in the upper chamber (102) and the lower chamber (103); the outer wall of the outer cover (1) is movably connected to a control terminal (2); the sampling inspection module comprises a first-stage module (5), a second-stage module (6) and a third-stage module (7); the first-stage module (5), the second-stage module (6) and the third-stage module (7) are arranged in a process flow pattern; a conveying mechanism (4) for conveying metal cans to the workstation is also movably installed in the upper chamber (102); and a rejection component (8) is provided in the upper chamber (102) beside the second-stage module (6).

2. The metal can appearance quality offline sampling inspection equipment according to claim 1 is characterized by: The conveying mechanism (4) comprises a support frame (401) arranged on a station fixing plate (101), a transverse movement module (402), and a grabbing module (403), wherein the transverse movement module (402) is arranged on an end surface of the support frame (401), and the grabbing module (403) is slidably arranged on a front side surface of the transverse movement module (402).

3. The off-line sampling inspection equipment for metal can appearance quality according to claim 2 is characterized by: The grabbing module (403) comprises a sliding platform (4031), an adapter plate (4032), a cylinder fixing plate (4033), a grabbing cylinder (4034) and a grabbing hand (4035); the front end surface of the sliding platform (4031) is fixedly connected to the adapter plate (4032); the cylinder fixing plate (4033) is vertically connected to the adapter plate (4032); the bottom of the cylinder fixing plate (4033) is fixedly installed with a grabbing cylinder (4034); and the side output end of the grabbing cylinder (4034) is correspondingly connected to the grabbing hand (4035).

4. The off-line sampling inspection equipment for metal can appearance quality according to claim 1 is characterized by: The first-stage module (5) comprises a first support column (501), a lifting and adjusting plate (502) and a manipulator (503), wherein the first support column (501) is arranged on the top of the station fixing plate (101), the lifting and adjusting plate (502) is correspondingly arranged on the side of the first support column (501), and the manipulator (503) is fixedly installed on the top of the lifting and adjusting plate (502).

5. The off-line sampling inspection equipment for metal can appearance quality according to claim 1 is characterized by: The second stage module (6) comprises a leveling fixing plate (601), a leveling support rod (602), a balance (603) and a wind shield (604), wherein the leveling fixing plate (601) is arranged beside the first support column (501), the leveling support rod (602) is distributed at four corners on the upper end surface of the leveling fixing plate (601), the top of the leveling support rod (602) is fixedly mounted with a balance (603), and a wind shield (604) is arranged around the outer side of the balance (603).

6. The off-line sampling inspection equipment for metal can appearance quality according to claim 1 is characterized by: The third stage module (7) comprises a camera module (701), a photographing station module (702) and an alignment module (703); the camera module (701) is fixedly mounted on the upper end surface of the station fixing plate (101); the photographing station module (702) is arranged on the opposite side of the camera module (701); and the alignment module (703) for calibrating the metal can is arranged on the side of the photographing station module (702).

7. The off-line sampling inspection equipment for metal can appearance quality according to claim 6 is characterized by: The camera module (701) comprises a second support column (7011), a slide fixing plate (7012), a slide (7013), a slider (7014), a camera fixing block (7015), a camera (7016), a light source fixing shaft (7017), a light source fixing block (7018) and a light shield (7019), wherein the second support column (7011) is arranged on the top of the station fixing plate (101), the slide fixing plate (7012) is arranged on the top of the second support column (7011), and the slide fixing block (7015) is arranged on the top of the station fixing plate (101). A slide table (7013) is installed on the upper end surface of the plate (7012), a slider (7014) is slidably installed on the slide table (7013), a camera (7016) is fixedly installed on the top of the slider (7014) through a camera fixing block (7015), the light source fixing axis (7017) is arranged on the side of the second support column (7011), a light source fixing block (7018) is provided on the top side of the light source fixing axis (7017), and a light cover (7019) is fixedly installed on the light source fixing block (7018).

8. The off-line sampling inspection equipment for metal can appearance quality according to claim 6 is characterized by: The photographing station module (702) comprises a driving motor (7021), a rotating platform seat (7022) and a rotating positioning table (7023); the driving motor (7021) is fixedly mounted on the bottom of the station fixing plate (101) via a mounting plate; the output end of the driving motor (7021) passes through the top of the station fixing plate (101) and is connected to the rotating platform seat (7022); the rotating platform seat (7022) is fixedly connected to the rotating positioning table (7023) for placing a metal can via a rotating shaft.

9. The off-line sampling inspection equipment for metal can appearance quality according to claim 1 is characterized by: The rejection assembly (8) comprises a slide body (801), a slide support plate (802) and a slide guide rod (803); the slide body (801) is arranged on the side of the second-stage module (6) via the slide support plate (802); and the slide guide rod (803) is arranged inside the slide body (801).

10. The off-line sampling inspection equipment for metal can appearance quality according to claim 1, characterized in that: A pre-processing module (9) for pre-processing the metal can is provided on the side of the outer cover (1).

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