An open barrel internal and external foreign matter detection device

Abstract

The utility model relates to photographing detection technology, to solve the detection efficiency low, the consistency is poor, the technical problem such as the risk of missing detection of the inside and outside wall of the existing open barrel, and a kind of open barrel inside and outside foreign matter detection device is provided, including roller conveying line, barrel rotating assembly, barrel detection device, barrel outside detection device and data processing module, barrel detection device includes first drive motor and vertical lifting device;The bottom of the lifting end of vertical lifting device is provided with bottom light source and first camera, for photographing collection to the bottom in the barrel;Second camera and third camera are arranged at intervals along vertical direction on vertical lifting device, for photographing collection to the lateral wall in the barrel;Barrel outside detection device includes the fourth camera and the fifth camera set on barrel outside detection support, for photographing collection to the lateral wall outside the barrel;Data processing module is used to receive the photographing data of each camera and carries out analysis processing.

Description

Technical Field

[0001] This utility model relates to the field of photographic detection technology, specifically to a device for detecting foreign objects inside and outside an open barrel. Background Technology

[0002] With the rapid development of automation technology, especially in some labor-intensive industries and enterprises, there is an urgent need for the development of automated and unmanned factories to replace traditional manual processing positions, save labor and production costs, and improve production efficiency.

[0003] The current manufacturing process of open-top iron drums is prone to appearance defects such as scratches, dents, rust spots, and uneven coatings. Before filling, manual visual inspection is required to ensure a neat and aesthetically pleasing appearance. The current manual inspection process involves operators visually inspecting the inner and outer walls of the drum with the naked eye or a handheld light source to determine the presence of foreign objects (such as metal fragments or dust) or defects (such as rust, dents, or coating peeling). However, manual inspection suffers from low efficiency, making it difficult to match with high-speed production lines. It is also highly subjective, with results depending on the inspector and resulting in poor consistency. Furthermore, it carries a high risk of missed inspections, as small foreign objects or hidden defects are easily overlooked. Finally, there is no data recording, making it difficult to trace the source of defects.

[0004] Meanwhile, for open-top iron drums produced in batches, inspection is carried out by sampling. This sampling inspection method has high limitations, as it can only inspect a small number of products, and the risk of missed inspection is high, resulting in a low pass rate for open-top iron drums, which cannot meet the needs of automated production. Utility Model Content

[0005] The purpose of this invention is to solve the technical problems of low detection efficiency, strong human subjectivity, poor consistency, lack of data recording, and high risk of missed detection in existing open barrel detection methods, and to propose a foreign object detection device for the inside and outside of open barrels.

[0006] To achieve the above objectives, the technical solution proposed by this utility model is as follows:

[0007] A device for detecting foreign objects inside and outside an open-top barrel includes a roller conveyor line and a rotating barrel assembly. The roller conveyor line is used to transport the barrel to be inspected to the inspection position; the rotating barrel assembly is located at the inspection position and is used to drive the barrel to be inspected to rotate axially. Its special feature is that:

[0008] It also includes an in-bucket detection device, an out-of-bucket detection device, and a data processing module. The in-bucket detection device is set above the detection position and faces the opening end of the bucket to be detected via an in-bucket detection bracket. The out-of-bucket detection device is set on one side of the detection position and faces the outer wall of the bucket to be detected via an out-of-bucket detection bracket.

[0009] The barrel-inside detection device includes a first drive motor fixed on the barrel-inside detection bracket and a vertical lifting device disposed at the drive end of the first drive motor; a bottom light source and a first camera are disposed at the bottom of the vertical lifting device for taking pictures of the bottom of the barrel; a second camera and a third camera are disposed in sequence along the vertical direction above the first camera on the vertical lifting device for taking pictures of the inner sidewall of the barrel.

[0010] The external detection device for the barrel includes a fourth camera and a fifth camera mounted on the external detection bracket. The fourth camera and the fifth camera are mounted vertically on the external detection bracket and are used to take pictures of the outer wall of the barrel.

[0011] The data processing module is used to receive and analyze the image data from each camera.

[0012] Furthermore, the rotating drum assembly includes a rotating drum support, a lifting platform, two sets of clamping mechanisms, and a second drive motor;

[0013] The two sets of clamping mechanisms are symmetrically arranged on both sides above the rotating drum support to clamp the outer side of the drum to be tested and prevent it from tilting.

[0014] Both sets of clamping mechanisms are equipped with rubber drive wheels that contact the outside of the barrel to be tested. The drive end of the second drive motor is connected to the rubber drive wheel and is used to drive the rubber drive wheel to rotate the barrel to be tested axially.

[0015] The lifting platform is mounted on the rotating drum support and located below the roller conveyor line. Multiple rubber driven wheels are evenly distributed along the circumference of the lifting platform to support the bottom of the drum to be tested and to drive the drum to be tested to rotate in conjunction with the rubber drive wheel.

[0016] Furthermore, each of the detection positions on the roller conveyor line has an upward channel corresponding to the multiple rubber driven wheels. When the barrel to be tested reaches the detection position, the multiple rubber driven wheels on the lifting platform pass through the corresponding upward channel to lift the bottom of the barrel to be tested, thereby separating the barrel to be tested from the roller conveyor line.

[0017] Furthermore, four rubber driven wheels are evenly distributed along the circumference of the lifting platform;

[0018] The rollers on the roller conveyor line located at the detection position are all broken in the middle to form a longitudinal lifting channel for the two rubber driven wheels arranged longitudinally on the lifting platform to rise.

[0019] A horizontal lifting channel is provided between two sets of rollers located above two rubber driven wheels arranged horizontally on the lifting platform;

[0020] When the bucket to be tested reaches the testing position, the four rubber driven wheels on the lifting platform sequentially pass through the corresponding longitudinal and transverse lifting channels to lift the bottom of the bucket to be tested, thereby separating the bucket from the roller conveyor line.

[0021] Furthermore, the angle α between the central axis of the first camera and the central axis of the barrel to be detected satisfies: 40°≤α≤50°;

[0022] The height A of the second camera from the bottom of the barrel to be detected and the height L of the barrel to be detected satisfy the following formula:

[0023] A = (2 / 5)L;

[0024] The height B of the third camera from the bottom of the barrel to be detected and the height L of the barrel to be detected satisfy the following formula:

[0025] B = (4 / 5)L.

[0026] Furthermore, an inner wall light source is provided on one side of the vertical lifting device to provide a light source for the second and third cameras.

[0027] Furthermore, the external detection bracket includes a horizontal connecting rod and a vertical connecting rod connected to each other, and the free end of the horizontal connecting rod is connected to the internal detection bracket.

[0028] An adjustment groove is provided on the vertical connecting rod along the vertical direction. The fourth camera and the fifth camera are connected to the adjustment groove on the vertical connecting rod in sequence through camera mounting bases. This is used to adjust the shooting angle of the fourth camera and the fifth camera on the outer wall of the barrel by changing the positional relationship between the camera mounting base and the adjustment groove.

[0029] Furthermore, the vertical connecting rod is equipped with an outer wall light source for providing a light source for the fourth and fifth cameras; the outer wall light source is connected to the adjustment slot via a light source mounting base, and is used to change the light source angle of the outer wall light source by changing the positional relationship between the light source mounting base and the adjustment slot.

[0030] Furthermore, the height C of the fourth camera from the bottom of the barrel to be detected and the height L of the barrel to be detected satisfy the following formula:

[0031] C = (2 / 5)L;

[0032] The height D of the fifth camera from the bottom of the barrel to be detected and the height L of the barrel to be detected satisfy the following formula:

[0033] D = (4 / 5)L.

[0034] Furthermore, the angle β between the second and third cameras and the inner wall light source, and the angle β between the fourth and fifth cameras and the outer wall light source... ’ All are: 25°~35°.

[0035] The beneficial effects of this utility model are:

[0036] [1] The structure of the foreign object detection device inside and outside the open barrel of this utility model is simple. Through multiple cameras on the detection device inside the barrel and the detection device outside the barrel, the bottom, inner and outer walls and edge areas of the barrel to be tested can be photographed and collected in a clear and comprehensive manner without blind spots. The degree of automation is high, which effectively improves the detection efficiency and accuracy of open barrels, and ensures the consistency of detection results and the product inspection pass rate.

[0037] [2] This utility model ensures that each camera can clearly capture information from each angle of the barrel to be inspected by using bottom light source, inner wall light source and outer wall light source. It can detect tiny defects at the millimeter level and effectively collect tiny foreign objects or hidden defects inside and outside the barrel, greatly reducing the risk of missed detection and improving the detection accuracy and reliability of the detection results.

[0038] [3] By reasonably setting the shooting angle between the first camera and the barrel to be tested, this utility model can more accurately take pictures of the bottom of the barrel, effectively avoiding the collection of small foreign objects or hidden defects.

[0039] [4] This utility model uses a vertical lifting device and an adjustment groove on a vertical connecting rod to change the installation positions of the fourth camera, the fifth camera and the outer wall light source, so that the detection device can meet the detection of open barrels of different sizes and models, effectively improving the practicality and applicability of the detection device.

[0040] [5] This utility model sets a rubber driven wheel on the lifting platform and sets an upward channel on the roller conveyor line for the rubber driven wheel to pass through, so that the rubber driven wheel can pass through the roller conveyor line to lift the bottom of the barrel to be tested and completely detach it from the roller conveyor line. This can effectively reduce the friction force when the barrel to be tested rotates and avoid wear on the bottom of the barrel during rotation, which would affect its appearance and quality. At the same time, it can also improve the transportation efficiency of the roller conveyor line. During the testing of the barrel to be tested, the upward channel does not affect the normal transportation of the roller conveyor line.

[0041] [6] This utility model uses a rotating drum assembly to precisely clamp and fix the drum to be tested. The rubber drive wheel and the rubber driven wheel work together to drive the drum to be tested to rotate, so that all contact points of the drum to be tested are dynamic friction when rotating, which effectively reduces the friction noise of the testing device and improves the testing efficiency, meeting the needs of automated production testing. Attached Figure Description

[0042] Figure 1 This is a front view of the structure of an embodiment of the foreign object detection device for an open barrel according to the present invention;

[0043] Figure 2 This is a rear view of the structure of an embodiment of the present utility model;

[0044] Figure 3 This is a schematic diagram of the internal detection device in the barrel during the implementation of this utility model;

[0045] Figure 4 This is a schematic diagram of the external detection device for the barrel in this utility model.

[0046] Figure 5 This is a schematic diagram of the structure of the transfer bucket assembly driving the bucket to be tested to rotate in this utility model (the roller conveyor line is not shown);

[0047] Figure 6 This is a partial structural diagram of the roller conveyor line in an embodiment of this utility model;

[0048] Figure 7 This is a schematic diagram showing the relative positional relationship between the roller conveyor line and the rubber driven wheel in an embodiment of this utility model;

[0049] Figure label:

[0050] 1-Roller conveyor line, 2-Roller assembly, 3-Barrel to be inspected, 4-In-barrel inspection device, 5-Out-barrel inspection device, 6-Data processing module, 7-In-barrel inspection bracket, 8-Out-barrel inspection bracket, 9-First drive motor, 10-Vertical lifting device, 11-Bottom light source, 12-First camera, 13-Second camera, 14-Third camera, 15-Fourth camera, 16-Fifth camera, 17-Horizontal connecting rod, 18-Vertical connecting rod, 19-Inner wall light source, 20-Outer wall light source, 21-Roller bracket, 22-Lifting platform, 23-Clamping mechanism, 24-Second drive motor, 25-Rubber drive wheel, 26-Rubber driven wheel, 27-Rising channel. Detailed Implementation

[0051] like Figure 1 and Figure 2 As shown, an open-top barrel foreign object detection device includes a roller conveyor line 1, a barrel rotating assembly 2, an internal barrel detection device 4, an external barrel detection device 5, and a data processing module 6; the roller conveyor line 1 is used to transport the barrel 3 to be detected to the detection position.

[0052] like Figure 5 As shown, the rotating drum assembly 2 is set at the detection position. The rotating drum assembly 2 includes a rotating drum bracket 21, a lifting platform 22, two sets of clamping mechanisms 23, and a second drive motor 24.

[0053] Two sets of clamping mechanisms 23 are symmetrically arranged on both sides above the rotating drum support 21 to clamp the outer side of the drum 3 to be tested and prevent it from tilting. Each set of clamping mechanisms 23 is provided with a rubber drive wheel 25 that contacts the outer side of the drum 3 to be tested. The drive end of the second drive motor 24 is connected to the rubber drive wheel 25 to drive the rubber drive wheel 25 to rotate the drum 3 to be tested axially. The clamping mechanism 23 includes an upper clamping assembly and a lower clamping assembly. The rubber drive wheel 25 is arranged on the upper clamping assembly. The lower clamping assembly is provided with an auxiliary wheel on the contact surface between the drum 3 and the drum 3 to be tested. When the rubber drive wheel 25 drives the drum 3 to rotate axially, it assists the drum 3 to rotate and reduces the friction between the drum 3 and the clamping mechanism 23.

[0054] The lifting platform 22 is mounted on the rotating drum support 21 and located below the roller conveyor line 1. Four rubber driven wheels 26 are evenly distributed along the circumference of the lifting platform 22 to support the bottom of the drum to be tested and, in conjunction with the rubber drive wheel 25, drive the drum 3 to rotate. Figure 6 and Figure 7 As shown, the rollers on the roller conveyor line 1 located at the detection position are all broken in the middle to form a longitudinal lifting channel for the two rubber driven wheels 26 arranged longitudinally on the lifting platform 22 to rise. A transverse lifting channel is provided between the two sets of rollers above the two rubber driven wheels 26 arranged transversely on the lifting platform 22. When the barrel to be tested 3 reaches the detection position, the four rubber driven wheels 26 on the lifting platform 22 pass through the corresponding longitudinal and transverse lifting channels in sequence to lift the bottom of the barrel to be tested, so that the barrel to be tested 3 is separated from the roller conveyor line 1.

[0055] When the test barrel 3 reaches the test position, the lifting platform 22 lifts the bottom of the test barrel 3 by four rubber driven wheels 26, detaching the test barrel 3 from the roller conveyor line 1. The two sets of clamping mechanisms 23 cooperate to clamp the outer side of the test barrel 3 to prevent it from tilting. Then, the second drive motor 24 drives the rubber drive wheel 25 to rotate. The friction between the rubber drive wheel 25 and the outer wall of the test barrel 3 drives the test barrel 3 to rotate in a fixed direction. When the test barrel 3 rotates, the four rubber driven wheels 26 on the lifting platform 22 cooperate with the rubber drive wheel 25 to drive the test barrel 3 to rotate, so that all contact points of the test barrel 3 are dynamic friction when rotating, which effectively reduces the friction noise of the test device. After the test is completed, the two sets of clamping mechanisms 23 and the lifting platform 22 are reset, and the test barrel 3 is placed back on the detachable turntable of the roller conveyor line 1.

[0056] The in-bucket detection device 4 is positioned above the detection position and directly opposite the opening end of the bucket 3 to be detected via the in-bucket detection bracket 7, and the out-of-bucket detection device 5 is positioned on one side of the detection position and directly opposite the outer wall of the bucket 3 to be detected via the out-of-bucket detection bracket 8.

[0057] like Figure 3 As shown, the barrel-in-detection device 4 includes a first drive motor 9 fixed on the barrel-in-detection bracket 7 and a vertical lifting device 10 disposed at the drive end of the first drive motor 9; the bottom of the vertical lifting device 10 is provided with a bottom light source 11 and a first camera 12 for taking pictures of the bottom of the barrel. The angle α between the central axis of the first camera 12 and the central axis of the barrel to be detected 3 satisfies: 40°≤α≤50°, which can achieve full coverage of the bottom of the barrel to be detected during the picture acquisition; the vertical lifting device 10 is located on the first camera 11 A second camera 13 and a third camera 14 are arranged vertically above the 2 to take pictures of the inner sidewall of the barrel. The height A of the second camera 13 from the bottom of the barrel 3 to be tested satisfies the following formula with respect to the height L of the barrel 3 to be tested: A = (2 / 5)L. The height B of the third camera 14 from the bottom of the barrel 3 to be tested satisfies the following formula with respect to the height L of the barrel 3 to be tested: B = (4 / 5)L. An inner sidewall light source 19 is provided on one side of the vertical lifting device 10 to provide a light source for the second camera 13 and the third camera 14 to take pictures.

[0058] When the barrel inspection device 4 is working, the first drive motor 9 drives the vertical lifting device 10 to move the bottom light source 11, the first camera 12, the second camera 13, and the third camera 14 downward into the barrel 3 to be inspected. Then, each camera takes pictures and collects data, and transmits the collected data to the data processing module 6 for analysis and processing. The data processing module 6 compares the collected photos with the stored defect photos, performs edge detection and texture analysis, determines whether the barrel 3 to be inspected has defects such as rust and scratches, and outputs the inspection results. After each camera finishes taking pictures, the vertical lifting device 10 moves the bottom light source 11, the first camera 12, the second camera 13, and the third camera 14 upward to exit the barrel 3 to be inspected.

[0059] like Figure 4As shown, the external detection device 5 includes a fourth camera 15 and a fifth camera 16 mounted on an external detection bracket 8. The external detection bracket 8 includes a horizontal connecting rod 17 and a vertical connecting rod 18 connected to each other. The free end of the horizontal connecting rod 17 is connected to the internal detection bracket 7. The fourth camera 15 and the fifth camera 16 are sequentially mounted on the vertical connecting rod 18 in the vertical direction for taking pictures of the outer wall of the barrel. An adjustment groove is provided on the vertical connecting rod 18 in the vertical direction. The fourth camera 15 and the fifth camera 16 are sequentially connected to the adjustment groove on the vertical connecting rod 18 through camera mounting bases. By changing the positional relationship between the camera mounting bases of the fourth camera 15 and the adjustment grooves of the fifth camera 16, the image angles of the fourth camera 15 and the fifth camera 16 on the outer wall of the barrel can be adjusted. An outer wall light source 20 is provided on one side of the vertical connecting rod 18. The outer wall light source 20 is connected to the adjustment groove via a light source mounting base and is used to provide a light source for the fourth camera 15 and the fifth camera 16. By changing the positional relationship between the light source mounting base and the adjustment groove, the light source angle of the outer wall light source 20 can be changed. The height C of the fourth camera 15 from the bottom of the barrel 3 to be tested satisfies the following formula with respect to the height L of the barrel 3 to be tested: C = (2 / 5)L; the height D of the fifth camera 16 from the bottom of the barrel 3 to be tested satisfies the following formula with respect to the height L of the barrel 3 to be tested: D = (4 / 5)L; the angle β between the second camera 13 and the third camera 14 and the inner wall light source 19, and the angle β between the fourth camera 15 and the fifth camera 16 and the outer wall light source 20 are also specified. ’ All angles are 25° to 35°, which can achieve full coverage of the inner and outer walls of the test barrel when taking pictures.

[0060] When the external inspection device 5 is working, it takes pictures of the outside of the barrel 3 to be inspected through the fourth camera 15 and the fifth camera 16, and transmits the captured data to the data processing module 6 for analysis and processing. The data processing module 6 compares the captured photos with the stored defect photos, performs edge detection and texture analysis, determines whether the barrel 3 to be inspected has defects such as rust and scratches, and outputs the inspection results.

Claims

1. A device for detecting foreign objects inside and outside an open-top barrel, comprising a roller conveyor (1) and a rotating barrel assembly (2), wherein the roller conveyor (1) is used to transport the barrel (3) to be inspected to the inspection position; the rotating barrel assembly (2) is disposed at the inspection position and is used to drive the barrel (3) to be inspected to rotate axially; characterized in that: It also includes an in-bucket detection device (4), an out-of-bucket detection device (5), and a data processing module (6); the in-bucket detection device (4) is set above the detection position and faces the opening end of the bucket (3) to be tested through an in-bucket detection bracket (7), and the out-of-bucket detection device (5) is set on one side of the detection position and faces the outer wall of the bucket (3) to be tested through an out-of-bucket detection bracket (8). The barrel-in-detection device (4) includes a first drive motor (9) fixed on the barrel-in-detection bracket (7) and a vertical lifting device (10) set at the drive end of the first drive motor (9); the bottom of the vertical lifting device (10) is provided with a bottom light source (11) and a first camera (12) for taking pictures of the bottom of the barrel; a second camera (13) and a third camera (14) are arranged in sequence along the vertical direction above the first camera (12) on the vertical lifting device (10) for taking pictures of the inner sidewall of the barrel; The external detection device (5) includes a fourth camera (15) and a fifth camera (16) set on the external detection bracket (8). The fourth camera (15) and the fifth camera (16) are set on the external detection bracket (8) in a vertical direction and are used to take pictures of the outer wall of the barrel. The data processing module (6) is used to receive and analyze the photo data from each camera.

2. The foreign object detection device for an open barrel according to claim 1, characterized in that: The rotating drum assembly (2) includes a rotating drum support (21), a lifting platform (22), two sets of clamping mechanisms (23), and a second drive motor (24); The two sets of clamping mechanisms (23) are symmetrically arranged on both sides above the rotating drum support (21) to clamp the outer side of the drum to be tested (3) to prevent it from tilting. Both sets of clamping mechanisms (23) are equipped with rubber drive wheels (25) that contact the outside of the barrel to be tested (3). The drive end of the second drive motor (24) is connected to the rubber drive wheel (25) to drive the rubber drive wheel (25) to rotate the barrel to be tested (3) axially. The lifting platform (22) is set on the rotating drum support (21) and located below the roller conveyor line (1). Multiple rubber driven wheels (26) are evenly distributed along the circumference of the lifting platform (22) to support the bottom of the drum to be tested and to drive the drum to be tested (3) to rotate in conjunction with the rubber drive wheel (25).

3. The foreign object detection device for an open barrel according to claim 2, characterized in that: The roller conveyor line (1) has a rising channel (27) at the detection position corresponding to the multiple rubber driven wheels (26). When the barrel to be tested (3) reaches the detection position, the multiple rubber driven wheels (26) on the lifting platform (22) pass through the corresponding rising channel (27) to lift the bottom of the barrel to be tested, so that the barrel to be tested (3) is separated from the roller conveyor line (1).

4. The foreign object detection device for an open barrel according to claim 3, characterized in that: The lifting platform (22) has four rubber driven wheels (26) evenly distributed along the circumference. The rollers on the roller conveyor line (1) located at the detection position are all broken in the middle to form a longitudinal lifting channel for the two rubber driven wheels (26) arranged longitudinally on the lifting platform (22) to rise. A horizontal lifting channel is provided between two sets of rollers above two rubber driven wheels (26) arranged horizontally on the lifting platform (22); When the test barrel (3) reaches the test position, the four rubber driven wheels (26) on the lifting platform (22) pass through the corresponding longitudinal and transverse lifting channels in sequence to lift the bottom of the test barrel, so that the test barrel (3) is separated from the roller conveyor line (1).

5. The foreign object detection device for an open barrel according to claim 1 or 4, characterized in that: The angle α between the central axis of the first camera (12) and the central axis of the barrel to be tested (3) satisfies: 40°≤α≤50°; The distance A between the second camera (13) and the bottom of the barrel (3) satisfies the following formula with respect to the height L of the barrel (3): A = (2 / 5)L; The distance B between the third camera (14) and the bottom of the barrel (3) to be tested satisfies the following formula with respect to the height L of the barrel (3): B = (4 / 5)L.

6. The foreign object detection device for an open barrel according to claim 5, characterized in that: The vertical lifting device (10) is provided with an inner wall light source (19) on one side, which is used to provide a light source for the second camera (13) and the third camera (14).

7. The foreign object detection device for an open barrel according to claim 6, characterized in that: The external detection bracket (8) includes a horizontal connecting rod (17) and a vertical connecting rod (18) connected to each other, and the free end of the horizontal connecting rod (17) is connected to the internal detection bracket (7). The vertical connecting rod (18) is provided with an adjustment groove along the vertical direction. The fourth camera (15) and the fifth camera (16) are connected to the adjustment groove on the vertical connecting rod (18) in sequence through camera mounting bases. The adjustment grooves are used to adjust the shooting angle of the fourth camera (15) and the fifth camera (16) on the outer wall of the barrel by changing the positional relationship between the camera mounting bases of the fourth camera (15) and the adjustment grooves.

8. The foreign object detection device for an open barrel according to claim 7, characterized in that: The vertical connecting rod (18) is provided with an outer wall light source (20) for providing a light source for the fourth camera (15) and the fifth camera (16); the outer wall light source (20) is connected to the adjustment slot through the light source mounting base, and is used to change the light source angle of the outer wall light source (20) by changing the positional relationship between the light source mounting base and the adjustment slot.

9. The foreign object detection device for an open barrel according to claim 8, characterized in that: The distance C between the fourth camera (15) and the bottom of the barrel (3) satisfies the following formula with respect to the height L of the barrel (3): C = (2 / 5)L; The distance D between the fifth camera (16) and the bottom of the barrel (3) to be tested satisfies the following formula with respect to the height L of the barrel (3): D = (4 / 5)L.

10. The foreign object detection device for an open barrel according to claim 9, characterized in that: The angle β between the second camera (13) and the third camera (14) and the inner wall light source (19), and the angle β between the fourth camera (15) and the fifth camera (16) and the outer wall light source (20) ’ All are: 25°~35°.

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