An automatic inspection device and method for defects in finished aluminum alloy ingots

Abstract

This invention relates to the field of visual inspection technology for aluminum alloy ingots, and provides an automatic defect detection device for finished aluminum alloy ingots, including an aluminum ingot forming machine and a roller conveyor. The aluminum ingot forming machine is equipped with a mold for forming aluminum alloy ingots, and the roller conveyor is equipped with a first support roller and a second support roller arranged symmetrically, forming an upward-facing space between the first support roller and the second support roller. This invention automates the inspection process through a machine vision system, effectively eliminating human subjectivity and significantly improving inspection efficiency and consistency. With the help of high-resolution imaging and intelligent algorithms, it can stably identify minute defects, and combined with a multi-angle layout, it achieves blind-spot-free inspection, greatly reducing the rate of missed detections and false judgments. At the same time, it automatically generates digital quality archives, providing a data foundation for quality traceability and process optimization. Its multi-support roller collaborative design can complete comprehensive inspection without flipping the product, simplifying the operation steps while ensuring integrity.

Description

Technical Field

[0001] This invention relates to the field of visual inspection of aluminum alloy ingots, and more specifically, to an automatic inspection device and method for defects in finished aluminum alloy ingots. Background Technology

[0002] In the casting production process of aluminum alloy ingots, the surface quality of the cast aluminum alloy ingots is one of the important indicators for measuring their quality. Common surface defects include cracks, cold shuts, slag inclusions, shrinkage cavities, surface roughness, etc. These defects not only affect the appearance of the product, but may also pose a potential threat to its subsequent processing performance and the mechanical properties of the final product.

[0003] Currently, the inspection of the appearance quality of aluminum alloy ingots generally relies on traditional manual visual inspection methods. That is, production line workers visually inspect the aluminum alloy ingots on the conveyor belt, judge whether there are defects on their surface based on their personal experience, and then manually sort them.

[0004] However, this manual inspection method has many inherent technical flaws, which seriously restrict production efficiency and product quality stability, mainly in the following aspects:

[0005] 1. The judgment criteria for manual inspection heavily rely on the worker's experience, skill level, mental state, and even physical condition on that day. Different inspectors, and even the same inspector, may have fluctuating judgment criteria for defects before and after fatigue, leading to a high rate of misjudgment and missed judgment, and making it impossible to form a unified, objective, and quantifiable quality standard;

[0006] 2. With the continuous increase in the speed of automated casting production lines, the reaction speed and processing capacity of manual inspection have gradually become a bottleneck in production. In a high-speed, continuous production environment, it is difficult for humans to maintain a high level of concentration for a long time, and visual fatigue can easily lead to a decrease in inspection efficiency, which cannot meet the needs of high-speed, real-time online inspection.

[0007] 3. Foundry workshops typically have harsh environments, including high temperatures and dust. Prolonged, high-intensity visual inspection work in such environments is detrimental to worker health, leading to high employee turnover and recruitment difficulties in this role. Consequently, companies need to continuously invest significant resources in training and management.

[0008] 4. Manual inspection is usually unable to accurately and automatically record and store the inspection results of each product; this makes it difficult to effectively collect and analyze quality data in the production process, making it impossible to achieve refined quality traceability and process improvement, thus hindering the construction of intelligent manufacturing and digital factories.

[0009] 5. The human eye has limited ability to identify minute cracks or defects that are close to the background color (such as light-colored inclusions); at the same time, for multiple surfaces of aluminum alloy ingots, manual inspection often has blind spots, making it difficult to achieve all-round, blind-spot-free inspection.

[0010] To address the aforementioned issues, this application proposes an automatic detection device and method for defects in finished aluminum alloy ingots. Summary of the Invention

[0011] The purpose of this invention is to provide an automatic inspection device and method for defects in finished aluminum alloy ingots, which solves the problems in the prior art through automated visual inspection.

[0012] The objective of this invention can be achieved through the following technical solution: An automatic defect detection device for finished aluminum alloy ingots, comprising an aluminum ingot forming machine and a roller conveyor, wherein the aluminum ingot forming machine is provided with a mold for forming aluminum alloy ingots, and the roller conveyor is equipped with symmetrically arranged first and second support rollers, forming an upward-facing space between the first and second support rollers, and a third support roller is also installed in the roller conveyor, forming an upward-facing space between the third support roller and the roller conveyor; the automatic detection device further includes:

[0013] The shooting group includes a top-down shooting mechanism, a first low-angle shooting mechanism, and a second low-angle shooting mechanism. The top-down shooting mechanism faces the aluminum alloy ingot on the roller conveyor. The first low-angle shooting mechanism corresponds to the low-angle shooting space formed by the first support roller and the second support roller. The second low-angle shooting mechanism corresponds to the low-angle shooting space formed between the third support roller and the roller conveyor.

[0014] Preferably, the first support roller is connected to the power supply of the roller conveyor, the third support roller is rotatably connected to the fixed frame, and the second and third support rollers are driven synchronously by the drive mechanism, so that the first support roller, the second support roller, and the third support roller rotate synchronously.

[0015] Preferably, the drive mechanism includes a synchronous motor and a chain drive assembly, with the chain drive assembly on the second support roller located on the side and the chain drive assembly on the third support roller located in the middle.

[0016] Preferably, the overhead shooting mechanism covers directly above the aluminum alloy ingot, the first downward shooting mechanism is located in the middle of the lower part of the aluminum alloy ingot, and the second downward shooting mechanism consists of two sets, located at the two ends of the lower part of the aluminum alloy ingot respectively.

[0017] Preferably, the aluminum alloy ingots corresponding to each group of second and first upward-facing mechanisms have at least partial overlap.

[0018] Preferably, each shooting mechanism in the shooting group includes a light shield, a viewfinder, an industrial camera, a lighting lamp, and a cover plate, with the viewfinder located close to the aluminum alloy ingot.

[0019] Preferably, a rejection mechanism is provided at the end of the roller conveyor away from the shooting group and the aluminum ingot forming machine. The rejection mechanism includes a long cylinder fixed on the roller conveyor and a push plate installed at the output end of the long cylinder.

[0020] Preferably, it also includes a bracket on which the controller and the data storage medium are respectively mounted.

[0021] The present invention also provides an automatic detection method for defects in finished aluminum alloy ingots, wherein the specific steps are as follows, based on the aforementioned automatic detection equipment:

[0022] S1. Molten aluminum is poured into the mold on the aluminum ingot forming machine and cooled to form an aluminum alloy ingot. Under the action of the aluminum ingot forming machine, the aluminum alloy ingot is transported to the roller conveyor, and the roller shaft on the roller conveyor drives the aluminum alloy ingot to be transported horizontally.

[0023] S2. The motor on the roller conveyor is controlled by the controller to move intermittently. The roller conveyor drives the aluminum alloy ingot to move to the bottom of the overhead shooting mechanism. The industrial camera in the overhead shooting mechanism takes pictures of the upper surface and the inclined side of the aluminum alloy ingot.

[0024] S3. The aluminum alloy ingot is moved to the first support roller and the second support roller by the roller conveyor, and the industrial camera in the first upward shooting mechanism takes a picture of the middle part of the lower surface of the aluminum alloy ingot.

[0025] S4. The aluminum alloy ingot is moved to the third support roller by the roller conveyor. The industrial cameras in the two second upward shooting mechanisms take pictures of both ends of the lower surface of the aluminum alloy ingot. At this time, the entire outer surface of the aluminum alloy ingot is completely photographed and the pictures are transmitted to the computer terminal for comparison.

[0026] S5. When the surface defects are within the preset threshold range, the aluminum alloy ingot is qualified and is transported to the clamping station by the roller conveyor. When the surface defects exceed the threshold, the aluminum alloy ingot is unqualified and is transported to the side of the rejection mechanism by the roller conveyor. The long cylinder rejects the unqualified aluminum alloy ingot from the side of the roller conveyor by the push plate.

[0027] Preferably, the intermittent movement points of the roller conveyor include at least the area directly below the overhead camera mechanism, the area directly above the first overhead camera mechanism, the area directly above the second overhead camera mechanism, and the side of the rejection mechanism, which are used for photographing and rejecting aluminum alloy ingots during intermittent periods.

[0028] The beneficial effects of this invention are:

[0029] This invention completely replaces manual visual inspection with a machine vision system, automating the inspection process, eliminating human subjectivity, and ensuring uniformity and impartiality in quality judgment. At the same time, the millisecond-level processing speed meets the cycle time requirements of high-speed production lines, significantly improving inspection efficiency.

[0030] This invention utilizes high-resolution imaging and intelligent algorithms to reliably identify minute defects (such as hairline cracks) that are difficult for the human eye to detect, and achieves blind-angle detection of product surfaces through multi-angle layout, thereby significantly reducing the missed detection rate and false judgment rate.

[0031] The detection process of this invention naturally generates and records a digital quality profile for each product, providing a data foundation for accurate end-to-end quality traceability and providing key data support for subsequent quality analysis, statistical process control and production process improvement.

[0032] This invention utilizes the cooperation between the first support roller, the second support roller, and the third support roller to perform all-round inspection without flipping the aluminum alloy ingot. The process is simple and ensures the integrity of the inspection. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0035] Figure 2 for Figure 1 A structural diagram viewed from below;

[0036] Figure 3 for Figure 1 A schematic diagram of the structure viewed from the left;

[0037] Figure 4 A schematic diagram of the roller conveyor and filming crew;

[0038] Figure 5 This is a schematic diagram of the drive mechanism;

[0039] Figure 6 An illustration of footage captured by the filming crew;

[0040] The attached diagram lists the components represented by each number as follows:

[0041] In the diagram: 1. Aluminum ingot forming machine; 2. Mold; 3. Roller conveyor; 31. First support roller; 32. Second support roller; 33. Fixing frame; 34. Third support roller; 35. Drive mechanism; 351. Synchronous motor; 352. Chain drive assembly; 4. Aluminum alloy ingot; 5. Shooting assembly; 51. Overhead shooting mechanism; 52. First upward shooting mechanism; 53. Second upward shooting mechanism; 501. Light shield; 502. Viewfinder; 503. Industrial camera; 504. Lighting lamp; 505. Cover plate; 6. Rejection mechanism; 61. Long cylinder; 62. Push plate; 7. Bracket; 8. Controller; 9. Data storage medium. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without inventive effort are within the scope of protection of this invention.

[0043] like Figure 1 - Figure 6 As shown, this embodiment provides an automatic defect detection device for finished aluminum alloy ingots, including an aluminum ingot forming machine 1 and a roller conveyor 3. The aluminum ingot forming machine 1 is equipped with a mold 2 for forming aluminum alloy ingots 4. The aluminum ingot forming machine 1 is equipped with a motor and a chain drive assembly to drive the mold 2 to rotate, forming a continuous operation. Figure 1 As shown, when mold 2 is above aluminum ingot forming machine 1, the large opening of mold 2 faces upward. At this time, molten aluminum can be directly poured into mold 2 through the casting equipment. During the process of mold 2 being conveyed to roller conveyor 3, a cooling mechanism (not shown) is used to form a solid aluminum alloy ingot 4. Mold 2 rotates under the action of aluminum ingot forming machine 1. At this time, the aluminum alloy ingot 4 in mold 2 will... Figure 1 The state shown is flipped over and falls onto roller conveyor 3.

[0044] Furthermore, in order to form a complete shooting space on the bottom surface of the image 4 on the roller conveyor 3, a first support roller 31 and a second support roller 32 are symmetrically arranged in the roller conveyor 3, and an upward shooting space is formed between the first support roller 31 and the second support roller 32. A third support roller 34 is also installed in the roller conveyor 3, and an upward shooting space is also formed between the third support roller 34 and the roller conveyor 3. The shooting group 5 includes a top-down shooting mechanism 51, a first upward shooting mechanism 52, and a second upward shooting mechanism 53. The top-down shooting mechanism 51 faces the aluminum alloy ingot 4 on the roller conveyor 3. The first upward shooting mechanism 52 corresponds to the upward shooting space formed by the first support roller 31 and the second support roller 32. The second upward shooting mechanism 53 corresponds to the upward shooting space formed between the third support roller 34 and the roller conveyor 3.

[0045] Specifically, the overhead shooting mechanism 51 covers the top of the aluminum alloy ingot 4, the first upward shooting mechanism 52 is located in the middle of the bottom of the aluminum alloy ingot 4, and the second upward shooting mechanism 53 consists of two sets, located at the two ends of the bottom of the aluminum alloy ingot 4 respectively.

[0046] More specifically, such as Figure 6 The diagram shows four shooting ranges. The overhead shooting mechanism 51 can capture the upper surface and four inclined sides of the aluminum alloy ingot 4. The two second overhead shooting mechanisms 53 and one first overhead shooting mechanism 52 capture the bottom surface of the aluminum alloy ingot 4. Each set of second overhead shooting mechanisms 53 and first overhead shooting mechanism 52 corresponds to aluminum alloy ingots 4 with at least partial overlap. The dotted lines in the diagram represent the overlap portion captured by the first overhead shooting mechanism 52 and the second overhead shooting mechanism 53, ensuring that defects in the overlap portion can be directly displayed.

[0047] Furthermore, the roller conveyor 3 is equipped with multiple horizontally arranged rollers, which are synchronously driven by a chain drive assembly and a motor for conveying the aluminum alloy ingot 4. The first support roller 31 is connected to the power unit on the roller conveyor 3. Specifically, the first support roller 31 has a sprocket extending from its side, which is connected to the chain drive assembly of the roller conveyor 3. The third support roller 34 is rotatably connected to the fixed frame 33. The fixed frame 33 is fixed to the light-shielding box 501 on the second upward-facing mechanism 53. The light-shielding box 501 is also fixed to the roller conveyor 3. The second support roller 32 and the third support roller 34 are synchronously driven by the drive mechanism 35, and the first support roller 31, the second support roller 32, and the third support roller 34 rotate synchronously.

[0048] Furthermore, the drive mechanism 35 includes a synchronous motor 351 and a chain drive assembly 352, such as Figure 4 As shown, the chain drive assembly 352 on the second support roller 32 is located on the side; as Figure 5 As shown, the chain drive assembly 352 on the third support roller 34 is located in the middle, and the drive mechanism 35 corresponding to the third support roller 34 is located below the fixed frame 33, so it will not interfere with or obstruct the photography of the aluminum alloy ingot 4. Specifically, the two synchronous motors 351 and the motor on the roller conveyor 3 are synchronously controlled, that is, the start and stop times are the same, the interval time is the same, and the speed is the same, so as to ensure that the aluminum alloy ingot 4 can be transported smoothly.

[0049] Furthermore, each shooting mechanism in the shooting group 5 includes a light shield 501, a viewfinder 502, an industrial camera 503, a lighting lamp 504, and a cover plate 505. The viewfinder 502 is close to the aluminum alloy ingot 4. In this embodiment, the light shield 501 is fixedly installed with the roller conveyor 3 to reduce external light interference. At the same time, it works with the lighting lamp 504 and the cover plate 505 to ensure the clarity of the shooting. The viewfinder 502 can block other objects except for the shooting, avoiding misjudgment when the computer compares the images.

[0050] Furthermore, a rejection mechanism 6 is provided at the end of the roller conveyor 3 away from the shooting group 5 and the aluminum ingot forming machine 1. The rejection mechanism 6 includes a long cylinder 61 fixed on the roller conveyor 3 and a push plate 62 installed at the output end of the long cylinder 61.

[0051] Specifically, the long cylinder 61 is connected to the cylinder starter and controller 8. After the computer determines that the aluminum alloy ingot 4 is unqualified, it will record it. When the aluminum alloy ingot 4 moves to the side of the rejection mechanism 6 and stops, the long cylinder 61 will work to remove the unqualified aluminum alloy ingot 4 from the roller conveyor 3.

[0052] Furthermore, it also includes a bracket 7, on which a controller 8 and a data storage medium 9 are respectively installed. The controller 8 is connected to a computer. The computer receives images taken by the industrial camera 503 and determines whether they are qualified. Then, it transmits the signal to the controller 8, which controls whether the rejection mechanism 6 works to achieve automatic rejection. The data storage medium 9 stores the captured photos, providing a data foundation for accurate full-process quality traceability and providing key data support for subsequent quality analysis, statistical process control, and production process improvement.

[0053] An automatic detection method for defects in finished aluminum alloy ingots, based on the aforementioned automatic detection equipment, comprises the following specific steps:

[0054] S1. Molten aluminum is poured into mold 2 on aluminum ingot forming machine 1 and cooled to form aluminum alloy ingot 4. Under the action of aluminum ingot forming machine 1, aluminum alloy ingot 4 is conveyed to roller conveyor 3, and the roller shaft on roller conveyor 3 drives aluminum alloy ingot 4 to be conveyed horizontally.

[0055] S2. The motor on the roller conveyor 3 is controlled to move intermittently under the action of the controller 8. The roller conveyor 3 drives the aluminum alloy ingot 4 to move below the overhead shooting mechanism 51. The industrial camera 503 in the overhead shooting mechanism 51 takes pictures of the upper surface and four inclined sides of the aluminum alloy ingot 4.

[0056] S3, aluminum alloy ingot 4 is moved to the first support roller 31 and the second support roller 32 by roller conveyor 3, and industrial camera 503 in the first upward shooting mechanism 52 takes a picture of the middle part of the lower surface of aluminum alloy ingot 4.

[0057] S4, aluminum alloy ingot 4 is moved to the third support roller 34 by roller conveyor 3, and industrial cameras 503 in the two second upward shooting mechanisms 53 take pictures of both ends of the lower surface of aluminum alloy ingot 4. At this time, the entire outer surface of aluminum alloy ingot 4 is completely photographed and the photos are transmitted to the computer terminal for comparison.

[0058] S5. When the surface defects are within the preset threshold range, the aluminum alloy ingot 4 is qualified and is conveyed to the clamping station by the roller conveyor 3. When the surface defects exceed the threshold, the aluminum alloy ingot 4 is unqualified and is conveyed to the side of the rejection mechanism 6 by the roller conveyor 3. The long cylinder 61 rejects the unqualified aluminum alloy ingot 4 from the side of the roller conveyor 3 by the push plate 62.

[0059] Furthermore, the intermittent movement points of the roller conveyor 3 include at least the area directly below the overhead camera mechanism 51, the area directly above the first overhead camera mechanism 52 and the second overhead camera mechanism 53, and the side of the rejection mechanism 6, which are used for photographing and rejecting the aluminum alloy ingot 4 during intermittent periods.

[0060] Understandably, this invention automates the inspection process through a machine vision system, effectively eliminating human subjectivity and significantly improving inspection efficiency and consistency. With the help of high-resolution imaging and intelligent algorithms, it can reliably identify minute defects, and combined with multi-angle layout, it achieves blind-spot-free inspection, greatly reducing the rate of missed detections and false judgments. At the same time, it automatically generates digital quality archives, providing a data foundation for quality traceability and process optimization. Its multi-support roller collaborative design can complete comprehensive inspection without flipping the product, simplifying the operation steps while ensuring integrity.

[0061] In the description of this invention, unless otherwise stated, "a plurality of" means two or more; it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inner", "around", etc., which indicate orientation or positional relationship, are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting this invention.

[0062] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An apparatus for automatically detecting defects in finished aluminum alloy ingots, comprising an aluminum ingot forming machine (1) and a roller conveyor (3), said aluminum ingot forming machine (1) being provided with a mold (2) for forming an aluminum alloy ingot (4), characterized in that, The roller conveyor (3) is provided with symmetrically arranged first supporting rollers (31) and second supporting rollers (32), and an upward shooting space is formed between the first supporting rollers (31) and the second supporting rollers (32), and the roller conveyor (3) is also provided with third supporting rollers (34), and an upward shooting space is also formed between the third supporting rollers (34) and the roller conveyor (3), and the automatic detection device further comprises a shooting group (5), the shooting group (5) comprises a downward shooting mechanism (51), a first upward shooting mechanism (52) and a second upward shooting mechanism (53), the downward shooting mechanism (51) is opposite to the aluminum alloy ingot (4) on the roller conveyor (3), the first upward shooting mechanism (52) corresponds to the upward shooting space formed by the first supporting rollers (31) and the second supporting rollers (32), and the second upward shooting mechanism (53) corresponds to the upward shooting space formed between the third supporting rollers (34) and the roller conveyor (3). The first supporting rollers (31) are connected with the roller conveyor (3) in a power connection mode, the third supporting rollers (34) are rotatably connected to the fixed frame (33), the second supporting rollers (32) and the third supporting rollers (34) are synchronously driven by the driving mechanism (35) respectively, and the first supporting rollers (31), the second supporting rollers (32) and the third supporting rollers (34) are synchronously rotated. The downward shooting mechanism (51) covers the aluminum alloy ingot (4) directly above, the first upward shooting mechanism (52) is located at the middle part below the aluminum alloy ingot (4), and the second upward shooting mechanism (53) comprises two groups and is located at two ends below the aluminum alloy ingot (4). Each shooting mechanism in the shooting group (5) comprises a light shielding box (501), a viewfinder frame (502), an industrial camera (503), an illuminating lamp (504) and a cover plate (505), and the viewfinder frame (502) is close to the aluminum alloy ingot (4).

2. The apparatus for automatically detecting defects of an aluminum alloy ingot product according to claim 1, characterized by: The driving mechanism (35) comprises a synchronous motor (351) and a chain transmission group (352), the chain transmission group (352) on the second supporting rollers (32) is located on the side surface, and the chain transmission group (352) on the third supporting rollers (34) is located in the middle part.

3. The apparatus for automatically detecting defects of an aluminum alloy ingot product according to claim 1, characterized in that: At least part of the aluminum alloy ingot (4) corresponding to each group of the second upward shooting mechanism (53) and the first upward shooting mechanism (52) is overlapped.

4. The apparatus for automatically detecting defects of an aluminum alloy ingot product according to claim 1, characterized in that: The end, away from the shooting group (5) and the aluminum ingot forming machine (1), of the roller conveyor (3) is provided with an ejecting mechanism (6), and the ejecting mechanism (6) comprises a long air cylinder (61) fixed to the roller conveyor (3) and a push plate (62) mounted on the output end of the long air cylinder (61).

5. The apparatus for automatically detecting defects of an aluminum alloy ingot product according to claim 1, characterized in that: The bracket (7) is further provided with a controller (8) and a data storage medium (9) respectively.

6. An aluminum alloy ingot product defect automatic detection method, the automatic detection apparatus according to any one of claims 1 to 5, characterized by, The specific steps are as follows: S1, the molten aluminum is poured into the mold (2) on the aluminum ingot forming machine (1) and cooled to form the aluminum alloy ingot (4), and the aluminum alloy ingot (4) is conveyed to the roller conveyor (3) under the action of the aluminum ingot forming machine (1) and horizontally conveyed by the roller shaft on the roller conveyor (3). S2, the motor on the roller conveyor (3) is controlled by the controller (8) to control intermittent motion, the roller conveyor (3) drives the aluminum alloy ingot (4) to move to the bottom of the aerial photography mechanism (51), the industrial camera (503) in the aerial photography mechanism (51) shoots the upper surface and four inclined side surfaces of the aluminum alloy ingot (4); S3, the aluminum alloy ingot (4) moves to the first support roller (31) and the second support roller (32) through the roller conveyor (3), the industrial camera (503) in the first overhead camera (52) shoots the middle part of the lower surface of the aluminum alloy ingot (4); S4, the aluminum alloy ingot (4) moves to the third support roller (34) through the roller conveyor (3), the industrial camera (503) in the two second overhead cameras (53) shoots the two ends of the lower surface of the aluminum alloy ingot (4), at this time the whole outer surface of the aluminum alloy ingot (4) is completely shot, and the photos are transmitted to the computer terminal for comparison; S5, when the surface defect is within the preset threshold range, it is qualified, and the aluminum alloy ingot (4) is conveyed to the clamping station through the roller conveyor (3); when the surface defect exceeds the threshold, it is unqualified, and the aluminum alloy ingot (4) is conveyed to the side of the rejection mechanism (6) through the roller conveyor (3), the long air cylinder (61) rejects the unqualified aluminum alloy ingot (4) from the side of the roller conveyor (3) through the push plate (62).

7. The method of claim 6, wherein the method further comprises: The intermittent motion point of the roller conveyor (3) is at least directly below the aerial photography mechanism (51), directly above the first overhead camera (52), directly above the second overhead camera (53), and the side of the rejection mechanism (6), which is respectively used for shooting and rejecting the aluminum alloy ingot (4) during intermittent motion.

Images