Square battery cover plate appearance detection device

Abstract

This invention discloses a rectangular battery cover appearance inspection device, including a machine base and an optical camera assembly mounted on its upper end. A cover conveyor line is installed on the left-middle part of the upper end of the machine base. A back-side inspection and unloading mechanism is installed on the upper end of the machine base, located to the left of the cover conveyor line. A back-side inspection loop is installed on the upper end of the machine base, located in front of the back-side inspection and unloading mechanism. A circular track unloading mechanism is also installed on the upper end of the machine base. This rectangular battery cover appearance inspection device employs automatic loading and unloading, working with the optical camera and conveyor module to complete product appearance inspection and automatically screening and rejecting unqualified products. This significantly reduces the labor costs required for rectangular battery cover appearance inspection and also greatly reduces secondary damage to the product surface, thereby improving the efficiency and yield of rectangular battery cover appearance inspection, reducing the production cost of rectangular battery covers, and solving the problem of inspection misjudgment caused by subjective human factors.

Description

Technical Field

[0001] This invention relates to the field of lithium battery manufacturing technology, specifically to a square battery cover appearance inspection device. Background Technology

[0002] In the production of lithium batteries, one of the components is a square battery cover. During production, the appearance of these square battery covers needs to be inspected. Currently, the appearance inspection of square battery covers is mostly done manually. However, because subjective human judgment is common, it is prone to errors due to human bias. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a square battery cover appearance inspection device to solve the problems mentioned in the background art.

[0004] A rectangular battery cover appearance inspection device includes a machine base and an optical camera assembly mounted on its upper end. A cover conveyor line is installed on the left side of the upper end of the machine base. A back-side inspection and unloading mechanism is installed on the upper end of the machine base, located to the left of the cover conveyor line. A back-side inspection circular line is installed on the upper end of the machine base, located in front of the back-side inspection and unloading mechanism. A circular track unloading mechanism is installed on the upper end of the machine base, located in front of the back-side inspection circular line. A tilting loading mechanism is installed on the upper end of the machine base, located to the right of the back-side inspection circular line. A mounting device is provided between the back-side inspection circular line and the tilting loading mechanism. The table has a turnover table assembly. A flipping assembly is mounted on the machine platform at the rear of the turnover table assembly. A second cover plate conveyor line is mounted on the machine platform to the right of the flipping and feeding mechanism. A front detection and unloading mechanism is mounted on the machine platform to the right of the second cover plate conveyor line. A third cover plate conveyor line is mounted on the machine platform to the right of the third cover plate conveyor line. A front-mounted circular track feeding PPU robot is mounted on the machine platform to the right of the third cover plate conveyor line. A front detection circular line is mounted on the machine platform to the rear of the front detection circular line. A PPU unloading robot is mounted on the machine platform to the rear of the front detection circular line. A unloading device is located to the right of the unloading PPU robot.

[0005] Furthermore, a material displacement mechanism is installed at the upper left rear corner of the machine platform, and a rotary table assembly is installed at the upper end of the machine platform, with the rotary table assembly located to the left of the material displacement mechanism.

[0006] Furthermore, a cover plate conveyor line four is installed on the left side of the rear end of the machine, and the cover plate conveyor line four is located below the material displacement mechanism.

[0007] Furthermore, a back-side detection and feeding mechanism is installed on the upper rear side of the machine platform, and a translational turnover table assembly is installed on the upper side of the machine platform, with the translational turnover table assembly located to the right of the back-side detection and feeding mechanism.

[0008] Furthermore, the unloading device includes a finished product conveyor line, an NG unloading mechanism, and an NG conveyor line. The finished product conveyor line is installed on the machine platform, the NG unloading mechanism is located above the finished product conveyor line and installed on the machine platform, and the NG conveyor line is located in front of the finished product conveyor line and installed on the machine platform.

[0009] Furthermore, a housing is fixed to the outer side of the upper part of the machine platform, and a feeding window is opened on the right side of the front end of the housing, which corresponds to the front of the NG conveyor line.

[0010] Furthermore, the mathematical model configuring the conveyor line speed and the optical camera assembly includes:

[0011] Formula 1:

[0012] Equation 2: H≥N c ×f×t p ;

[0013] Formula 3:

[0014] In the formula, v is the conveyor linear velocity; L is the length of a single cover plate; f is the camera's shooting frequency; t p N represents the processing time for a single image. c T represents the total number of cameras; sys H represents the system response time; H represents the total processing capacity of the system.

[0015] Equation 1 is a mathematical model of the conveyor line speed and the camera shooting frequency; Equation 2 is a mathematical model of the data processing capability of the optical camera system; Equation 3 is a mathematical model of the system response time.

[0016] Furthermore, during configuration, the minimum shooting frequency is first calculated using Equation 1, then the computational data processing capability of the optical camera system is calculated according to Equation 2, and then the system response time is calculated according to Equation 3. The system of inequalities is solved to obtain the inequality relationship model between the camera's shooting frequency f and the conveyor linear velocity v. The camera's shooting frequency f and conveyor linear velocity v are selected based on the inequality relationship model.

[0017] The beneficial effects of this invention are as follows: This square battery cover appearance inspection equipment adopts automatic loading and unloading, and completes product appearance inspection in conjunction with an optical camera and conveyor module. It automatically screens and rejects unqualified products, thereby significantly reducing the labor costs required for square battery cover appearance inspection and also greatly reducing secondary damage to the product surface. This improves the efficiency and yield of square battery cover appearance inspection, reduces the production cost of square battery covers, and solves the problem of inspection misjudgment caused by subjective human factors. It achieves efficient and accurate automated inspection, solving many problems existing in traditional manual inspection. The specific beneficial effects are as follows:

[0018] 1. Automated inspection, reduced labor costs: The equipment adopts an automated loading and unloading system, reducing reliance on manual labor and lowering labor costs. Product appearance inspection is completed through optical cameras and a conveyor module, eliminating the need for manual visual inspection and further reducing labor requirements. The equipment can automatically identify and reject defective products, reducing the need for manual screening.

[0019] 2. Improved Detection Accuracy: The equipment is equipped with multiple optical cameras covering all detection areas of the cover plate, ensuring accurate detection of each area and reducing the possibility of missed or false detections. The camera's shooting frequency is dynamically adjusted according to the conveyor speed and cover plate size to ensure that each cover plate is completely captured, thus improving detection accuracy.

[0020] 3. Reduce secondary damage to product surfaces: The equipment employs automated operation, reducing the number of times humans handle the product and lowering the risk of secondary damage. Precise robotic arm and conveyor line control ensure the stability and safety of the product during the testing process, further reducing the risk of damage.

[0021] 4. Improve yield rate: The equipment can automatically identify and reject defective products, thereby improving the yield rate and reducing the scrap rate.

[0022] 5. Improve the level of production automation: The equipment integrates multiple functional modules such as loading and unloading, detection, and screening, realizing full-process automation and improving the level of production automation. Attached Figure Description

[0023] Figure 1 This is a top view of the machine tool of the present invention;

[0024] Figure 2 This is a partial schematic diagram of the left side of the machine tool of the present invention;

[0025] Figure 3 This is a partial schematic diagram of the middle part of the machine tool of the present invention;

[0026] Figure 4 This is a partial schematic diagram of the right side of the machine tool of the present invention;

[0027] Figure 5 This is a schematic diagram of the overall structure of the present invention.

[0028] In the diagram: 1-Incoming material displacement mechanism, 2-Rotating turntable assembly, 3-Cover plate conveyor line four, 4-Backside inspection and loading mechanism, 5-Transfer turntable assembly, 6-Cover plate conveyor line one, 7-Backside inspection and unloading mechanism, 8-Backside inspection circular line, 9-Circular track unloading mechanism, 10-Tilting loading mechanism, 11-Turntable assembly, 12-Tilting assembly, 13-Cover plate conveyor line two, 14-Frontside inspection and unloading mechanism, 15-Cover plate conveyor line three, 16-Frontside circular track loading PPU robot, 17-Frontside inspection circular line, 18-Unloading PPU robot, 19-Finished product conveyor line, 20-NG unloading mechanism, 21-NG conveyor line, 22-Machine base, 23-Machine housing, 24-Unloading window, 25-Optical camera assembly. Detailed Implementation

[0029] Please see Figures 1-5 A square battery cover appearance inspection device includes a machine base 22 and an optical camera assembly 25 mounted on its upper end. A material inlet displacement mechanism 1 is installed at the upper left rear corner of the machine base 22. A rotary turntable assembly 2 is installed on the upper end of the machine base 22, located to the left of the material inlet displacement mechanism 1. A cover conveyor line 4 3 is installed on the left rear end of the machine base 22, located below the material inlet displacement mechanism 1. A back-side inspection and feeding mechanism 4 is installed on the middle rear side of the upper end of the machine base 22. A translational turntable assembly 5 is installed on the upper end of the machine base 22, located to the right of the back-side inspection and feeding mechanism 4. The left-middle section is equipped with a cover plate conveyor line 1 6. The material displacement mechanism 1 moves the square battery cover plate to be inspected into the equipment. Then, the rotating turntable assembly 2 rotates and moves the square battery cover plate to the cover plate conveyor line 4 3. The cover plate conveyor line 4 3 conveys the square battery cover plate from left to right to the back inspection and feeding mechanism 4. Then, the two products are conveyed and transferred to the cover plate conveyor line 1 6 through the translation turntable assembly 5. Then, the cover plate conveyor line 1 6 conveys the two products from right to left, passing through eight sets of optical camera assemblies 25 distributed on the left and right sides in sequence, which are used to inspect the back of the product and the length dimension surface, a total of nine structural areas.

[0030] A back-side inspection and unloading mechanism 7 is installed on the upper end of the machine base 22. The back-side inspection and unloading mechanism 7 is located on the left side of the cover plate conveyor line 6. A back-side inspection loop line 8 is installed on the upper end of the machine base 22. The back-side inspection loop line 8 is located in front of the back-side inspection and unloading mechanism 7. The back-side inspection and unloading mechanism 7 picks up two products from the cover plate conveyor line 6 and places them on the back-side inspection loop line 8. The back-side inspection loop line 8 conveys the two products through two sets of optical camera assemblies 25 distributed above, which are used to inspect the entire back of the product and two structural areas.

[0031] A circular track unloading mechanism 9 is installed on the upper end of the machine base 22. The circular track unloading mechanism 9 is located in front of the back detection circular line 8. A flipping loading mechanism 10 is installed on the upper end of the machine base 22. The flipping loading mechanism 10 is located to the right of the back detection circular line 8. A turnover table assembly 11 is installed on the machine base 22 between the back detection circular line 8 and the flipping loading mechanism 10. A flipping assembly 12 is installed on the machine base 22 behind the turnover table assembly 11. A cover plate conveyor line 2 13 is installed on the right side of the flipping loading mechanism 10. The circular track unloading mechanism 9 picks up two products from the back detection circular line 8 and places them on the turnover table assembly 11. Then, the flipping loading mechanism 10 picks up the two products and places them on the flipping assembly 12. The flipping assembly 12 flips the two products 180 degrees and places them on the cover plate conveyor line 2 13. The cover plate conveyor line 2 13 conveys the two products through eight sets of optical camera assemblies 25 distributed on the left, right and upper sides, for detecting a total of twelve structural areas of the front and length dimensions of the product.

[0032] The right side of the cover plate conveyor line 213 is equipped with a front detection and unloading mechanism 14 mounted on the machine base 22. The right side of the front detection and unloading mechanism 14 is equipped with a cover plate conveyor line 315 mounted on the machine base 22. The right side of the cover plate conveyor line 315 is equipped with a front-facing circular track feeding PPU robot 16 mounted on the machine base 22. Behind the front-facing circular track feeding PPU robot 16 is a front detection circular line 17 mounted on the machine base 22. Behind the front detection circular line 17 is an unloading PPU robot 17 mounted on the machine base 22. 8. The front inspection unloading mechanism 14 picks up two products from the cover plate conveyor line 2 13 and places them on the cover plate conveyor line 3 15. The cover plate conveyor line 3 15 conveys the products to the front ring rail loading PPU robot 16. The front ring rail loading PPU robot 16 picks up one product at a time and places it into the front inspection ring line 17. The front inspection ring line 17 conveys one product through four sets of optical camera assemblies 25 distributed on the left, right and top sides, which are used to inspect the overall front and width dimensions of the product, totaling four structural areas.

[0033] The PPU unloading robot 18 has an unloading device on its right side, which includes a finished product conveyor line 19, an NG unloading mechanism 20, and an NG conveyor line 21. The finished product conveyor line 19 is installed on the machine base 22. The NG unloading mechanism 20 is located above the finished product conveyor line 19 and is installed on the machine base 22. The NG conveyor line 21 is located in front of the finished product conveyor line 19 and is installed on the machine base 22. A housing 23 is fixed to the outer side of the upper end of the machine base 22. A unloading window 24 is opened on the right side of the front end of the housing 23. The unloading window 24 corresponds to the front of the NG conveyor line 21. The PPU unloading robot 18 grabs a product from the front detection loop line 17 and places it on the finished product conveyor line 19. The NG unloading mechanism 20 grabs the NG product on the finished product conveyor line 19 and puts it into the NG conveyor line 21 according to the detection result of the optical camera component 25. Finally, the product is conveyed out of the unloading window 24 by the finished product conveyor line 19 and sent to the equipment of the subsequent process.

[0034] This square battery cover appearance inspection equipment uses automatic loading and unloading, and works with an optical camera and conveyor module to complete the product appearance inspection. It automatically screens and rejects unqualified products, thereby greatly reducing the labor cost required for square battery cover appearance inspection and also greatly reducing secondary damage to the product surface. This improves the efficiency and yield of square battery cover appearance inspection, reduces the production cost of square battery covers, and solves the problem of inspection misjudgment caused by subjective human factors.

[0035] To ensure that the shooting frequency and data processing capabilities are matched when multiple cameras are working simultaneously, and to avoid data processing bottlenecks, this application configures a mathematical model between the conveyor line speed and the optical camera components, including the following steps:

[0036] First, the basic parameters are defined as follows: v is the conveyor linear speed (unit: m / s); L is the length of a single cover plate (unit: m); f i Let t be the shooting frequency of the i-th camera (in Hz); p N represents the processing time for a single image (in seconds). c N represents the total number of cameras. r The number of areas each camera is responsible for detecting; T sys System response time (unit: seconds).

[0037] The calculation of the camera's shooting frequency, specifically, the time t for each cover plate to pass through the camera's field of view is: To ensure that each cover plate is captured completely, the shooting frequency of each camera is f. i It should meet the following requirements: The data processing capability of an optical camera system is calculated as follows: Assuming all cameras are configured to have the same shooting frequency, and the shooting frequency of each camera is defined as f, then the total shooting frequency is: F total =N c ×f; The number of images generated per second is:

[0038] I per_sec =F total To ensure that data processing does not become a bottleneck, the system's total processing capacity H should satisfy the following:

[0039] H≥I per_sec ×t p ;

[0040] System response time calculation, specifically, system response time T sys This includes image transmission time, processing time, and decision-making time. The time for each step is defined as t. trans t proc and t dec Then: T sys =t trans +t proc +t dec To ensure that system response time does not become a bottleneck, the following should be met:

[0041] Combining the above formulas, we obtain the following mathematical model:

[0042] Equation 1, Mathematical model of conveyor linear velocity and camera shooting frequency:

[0043] Equation 2, Mathematical model of the data processing capability of an optical camera system: H ≥ N c ×f×t p ;

[0044] Equation 3, Mathematical model of system response time:

[0045] In this embodiment, it is also necessary to ensure that the position and angle of each camera can cover all areas to be inspected, avoiding blind spots. The number of cameras should be rationally configured according to the number and complexity of the inspection areas; nine structural areas are needed for back-side inspection, and twelve structural areas for front-side inspection, ensuring that each area has a corresponding camera for inspection. The camera shooting frequency should be dynamically adjusted according to the conveyor line speed and cover plate size. When the conveyor line speed increases, the camera shooting frequency should be increased accordingly to ensure that each cover plate is completely captured. Synchronization between all cameras and the conveyor line should be ensured to prevent data loss or duplicate inspections due to asynchrony. The workload of each camera should be rationally allocated to avoid situations where some cameras are overloaded while others are idle.

[0046] In one specific embodiment, the cover plate length L = 0.2m, and the total number of cameras N c =14 (8 back-side inspection units, 6 front-side inspection units), processing time t for each image p =0.1s, system response time Tsys =0.2s.

[0047] Calculate the minimum shooting frequency:

[0048] Calculate the total shooting frequency: F total =14×f;

[0049] Computational data processing capability: H ≥ 14 × f × 0.1;

[0050] Calculate system response time:

[0051] Solving the above system of inequalities, we can obtain:

[0052] Therefore, the camera's shooting frequency f should satisfy:

[0053] Choose appropriate values ​​for v and f based on actual needs, ensuring all conditions are met. For example, if v = 0.07 m / s is chosen, then: Therefore, we can choose f = 0.35Hz, which satisfies all the conditions.

[0054] The above configuration ensures coordination between the conveyor line speed and the optical camera components, avoids data processing bottlenecks, and improves detection efficiency and accuracy.

[0055] This square battery cover appearance inspection equipment employs automated loading and unloading, utilizing an optical camera and conveyor module to complete product appearance inspection and automatically screen out defective products. This significantly reduces the labor costs required for square battery cover appearance inspection and also greatly minimizes secondary damage to the product surface, thereby improving inspection efficiency and yield, lowering production costs, and solving the problem of inspection errors caused by subjective human factors. It achieves efficient and accurate automated inspection, resolving many problems inherent in traditional manual inspection, specifically as follows:

[0056] 1. Automated inspection, reduced labor costs: The equipment adopts an automated loading and unloading system, reducing reliance on manual labor and lowering labor costs. Product appearance inspection is completed through optical cameras and a conveyor module, eliminating the need for manual visual inspection and further reducing labor requirements. The equipment can automatically identify and reject defective products, reducing the need for manual screening.

[0057] 2. Improved Detection Accuracy: The equipment is equipped with multiple optical cameras covering all detection areas of the cover plate, ensuring accurate detection of each area and reducing the possibility of missed or false detections. The camera's shooting frequency is dynamically adjusted according to the conveyor speed and cover plate size to ensure that each cover plate is completely captured, thus improving detection accuracy.

[0058] 3. Reduce secondary damage to product surfaces: The equipment employs automated operation, reducing the number of times humans handle the product and lowering the risk of secondary damage. Precise robotic arm and conveyor line control ensure the stability and safety of the product during the testing process, further reducing the risk of damage.

[0059] 4. Improve yield rate: The equipment can automatically identify and reject defective products, thereby improving the yield rate and reducing the scrap rate.

[0060] 5. Improve the level of production automation: The equipment integrates multiple functional modules such as loading and unloading, detection, and screening, realizing full-process automation and improving the level of production automation.

Claims

1. A square battery cover appearance inspection device, comprising a machine base (22) and an optical camera assembly (25) mounted on its upper end, characterized in that: A cover plate conveyor line (6) is installed on the upper left side of the machine base (22). A back detection unloading mechanism (7) is installed on the upper end of the machine base (22). The back detection unloading mechanism (7) is located to the left of the cover plate conveyor line (6). A back detection loop line (8) is installed on the upper end of the machine base (22). The back detection loop line (8) is located in front of the back detection unloading mechanism (7). A ring track unloading mechanism (9) is installed on the upper end of the machine base (22). The ring track unloading mechanism (9) is located in front of the back detection loop line (8). A flipping loading mechanism (10) is installed on the upper end of the machine base (22). The flipping loading mechanism (10) is located to the right of the back detection loop line (8). A turnover table assembly (11) is installed on the machine base (22) between the back detection loop line (8) and the flipping loading mechanism (10). The turnover table assembly (11) is located on the rear side of the machine base (22). A flipping assembly (12) is installed on the machine base (22). A cover plate conveyor line II (13) is installed on the machine base (22) to the right of the flipping feeding mechanism (10). A front detection unloading mechanism (14) is installed on the machine base (22) to the right of the cover plate conveyor line II (13). A cover plate conveyor line III (15) is installed on the machine base (22) to the right of the front detection unloading mechanism (14). A front ring rail feeding PPU robot (16) is installed on the machine base (22) to the right of the cover plate conveyor line III (15). A front ring rail feeding PPU robot (16) is installed on the machine base (22) to the rear of the front ring rail feeding PPU robot (16). A front detection ring line (17) is installed on the machine base (22) to the rear of the front detection ring line (17). A unloading PPU robot (18) is installed on the machine base (22) to the rear of the front detection ring line (17). A unloading device is installed on the right of the unloading PPU robot (18). The mathematical model configuring the relationship between the conveyor line speed and the optical camera components includes: Formula 1: ; Formula 2: ; Formula 3: ; In the formula, v is the conveyor linear velocity; L is the length of a single cover plate; f is the camera's shooting frequency; t p N represents the processing time for a single image. c T represents the total number of cameras; sys H represents the system response time; H represents the total processing capacity of the system. Equation 1 is a mathematical model of the conveyor line speed and the camera shooting frequency; Equation 2 is a mathematical model of the data processing capability of the optical camera system; Equation 3 is a mathematical model of the system response time. During configuration, the minimum shooting frequency is first calculated using Equation 1, then the computational data processing capability of the optical camera system is calculated according to Equation 2, and then the system response time is calculated according to Equation 3. The system of inequalities is solved to obtain the inequality relationship model between the camera's shooting frequency f and the conveyor linear speed v. The camera's shooting frequency f and conveyor linear speed v are selected based on the inequality relationship model.

2. The square battery cover appearance inspection device according to claim 1, characterized in that: The upper left rear corner of the machine base (22) is equipped with a material displacement mechanism (1), and the upper end of the machine base (22) is equipped with a rotary table assembly (2), which is located to the left of the material displacement mechanism (1).

3. The square battery cover appearance inspection device according to claim 2, characterized in that: The machine (22) is equipped with a cover plate conveyor line four (3) on the left side of the rear end, and the cover plate conveyor line four (3) is located below the material displacement mechanism (1).

4. The square battery cover appearance inspection device according to claim 3, characterized in that: The machine base (22) is equipped with a back detection and feeding mechanism (4) on the upper rear side, and a translational turnover table assembly (5) is installed on the upper end of the machine base (22). The translational turnover table assembly (5) is located to the right of the back detection and feeding mechanism (4).

5. The square battery cover appearance inspection device according to claim 1, characterized in that: The feeding device includes a finished product conveyor line (19), an NG feeding mechanism (20), and an NG conveyor line (21). The finished product conveyor line (19) is installed on the machine base (22). The NG feeding mechanism (20) is located above the finished product conveyor line (19) and installed on the machine base (22). The NG conveyor line (21) is located in front of the finished product conveyor line (19) and installed on the machine base (22).

6. The square battery cover appearance inspection device according to claim 5, characterized in that: The upper outer side of the machine base (22) is fixed with a housing (23), and a feeding window (24) is opened on the right side of the front end of the housing (23). The feeding window (24) corresponds to the front of the NG conveyor line (21).

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